SUMMARY: This article reviews a device that “triggers” the LabRadar chronograph to register bullet speed. Rather than activate by sound or Doppler reading, this $35 JKL Inertial Trigger works from the rifle’s instantaneous recoil pulse when a shot is fired. After some frustration with his LabRadar when shooting at a range with reflective surfaces, our tester is now reporting that 100% of his actual shots are being captured correctly by his LabRadar chrono equipped with the JKL Inertial Trigger. He won’t use his LabRadar without it now. Other users have become instant fans of this inertial LabRadar trigger as well. It is very affordable and it works great. VIEW LARGE PHOTO.
JKL Inertial Trigger for LabRadar Chronograph
Product Review by F Class John
The LabRadar chronograph has been one of the most revolutionary tools in the shooting world because of how it collects velocity data, how it reports (and stores) that data, and, ultimately, the ease with which it can be positioned and operated. However, it’s not a perfect system. A majority of the complaints come from users whose LabRadars sometimes fail to record all the shots fired in a string. For the average plinker, this may not be an issue. But for serious shooters trying to do ladder tests or load development requiring all shots to be reported, it can be frustrating when a shot is missed.
Traditionally, LabRadar has recommended trying different settings that compensate for the gap between the unit and muzzle as well as well as having different options for how the unit recognizes a shot fired. While these options work to some degree, they aren’t a guaranteed fix especially when shooting at ranges with concrete baffles or with roofs, walls, and dividers that can alter sound waves. While nobody can precisely explain why shots are lost under certain circumstances, the fact remains it DOES happen. In addition, the default system can sometimes pick up stray shots from nearby rifles.
Not willing to give up on this sophisticated chronograph, many shooters have looked for a foolproof way to prevent such failures from happening. In fact, for this shooter, the frustration was so high that I actually sold my first LabRadar and went back to another chronograph before ultimately buying another LabRadar almost a year later. But I made that repeat purchase only after vowing to finding a way to make the LabRadar work — EVERY time, for EVERY shot.
See How JKL Inertial Trigger Works in this Video
JKL Inertial Trigger — Outstanding Product That Works Great
Enter the JKL Gen 2 Trigger for the LabRadar. This is an easy-to-use, inertial-driven trigger that activates simply from the recoil of your gun. The unit consists of a small rectangular pad attached to a long audio cable. All you do is plug in the audio cable, attach the pad to your gun with the provided hook and loop (Velcro) material. Then (important), you must change the LabRadar trigger settings from “Doppler” to “Trigger”. The unit works great and is easy to set up. In my experience, the unit will activate no matter where you place it on a stock. However the recoil of every gun is slightly different, so you will need to make sure you find a location that doesn’t interfere with your shooting setup.
An unexpected benefit of using the JKL trigger is that it gives you a larger area in which to place your Labradar unit, making it more convenient to setup on benches or range stations. I found this a welcome relief since the LabRadar originally seemed somewhat fussy about where I placed it. Now I can place the LabRadar in more convenient locations — as long as it’s still near my gun and pointed at the target correctly, I get consistent bullet speed data.
Are There Issues with “False Positives”?
If there is any downside to using the JKL Inertial Trigger, it’s that a very hard bump or aggressive working of the action can trigger a false reading. However these are easy to identify in your data, because the speed value is way lower than true fired shot values. Simply remove that low entry or otherwise ignore it in your calculations. To be fair, this “bump activation” really doesn’t happen very often once you get used to using the inertial trigger.
SUMMARY — Outstanding Accessory for LabRadar Users
Bottom line — if you own a LabRadar, then definitely get a JKL Inertial Trigger. Priced at just $35.00 this device is not expensive, yet it’s one of the most effective accessories you can buy for the LabRadar. I’ve recommended these inertial triggers to dozens of shooters. Every one of those guys who did buy a JKL trigger says they can’t imagine using a LabRadar without one. If you love what the LabRadar can do, but have been frustrated with shots not getting recorded 100% of the time, then definitely get yourself a JKL Inertial Trigger. It turns a good system into an amazing system. JKL Industries states that its inertial trigger “will work on anything from a .22 LR to a suppressed system or with standard rifle and brake.”
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The Magnetospeed V3 chronograph is affordable, easy to transport, and easy to set up. With a MagnetoSpeed barrel-mounted chrono you can quickly and easily record muzzle velocity (MV) without having to set up tripods or walk down-range. The compact MagnetoSpeed chronos are easy to operate and transport. With the full-featured V3 model, everything you need comes in a small fitted case. In the top photo are the components used with the MagnetoSpeed V3 Kit:
1. V3 Bayonet sensor
2. Display and control unit
3. Bayonet spacers (plastic and rubber)
4. Cords and mounting hardware (left), suppressor heat shield (right)
5. Alignment rod (square cross-section)
6. Rail adapter (sold separately)
Our friend Gavin Gear of UltimateReloader.com reviewed the MagnetoSpeed V3 and came away impressed. Gavin explains that a good chrono is essential: “If you want to load and shoot precision ammunition, you need the tools that will produce and validate the precision of your loads. A good chronograph is one of those tools! In this post I’m going to introduce you to the MagnetoSpeed V3 chonograph, the high-end electromagnetic chronograph which fills out the top slot in MagnetoSpeed’s equipment portfolio.”
In this 11-minute video Gavin reviews MagnetoSpeed’s top-of-the-line V3 Chronograph. He shows what ships with the unit, how to set it up for both rifles and pistols, and then he puts it through its paces showing how it captures velocity data. Gavin says he will follow-up with future videos showing how to link the MagnetoSpeed V3 to your mobile phone and how to log velocity data for future reference. To learn more about this high-tech chrono, visit UltimateReloader.com.
Given its compact size, reasonable price, and easy of set-up, we believe all serious shooters should have a MagnetoSpeed in their gear collection even if their primary chronograph is a LabRadar. The MagnetoSpeed V3 complete system is available now for $399.99 from Sportsman’s Warehouse (MSRP is $449.00). A Labadar Chrono by itself is $625.00 but they are currently out-of-stock.
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To optimize your loads and to generate precise ballistics tables, you need a quality chronograph. Having precise readings of bullet muzzle velocities lets you calculate ES and SD to determine the most repeatable load with least vertical dispersion. Very accurate velocity data is also essential to created a precise drop table for long range and to predict the effect of winds. There are many good chronographs on the market, ranging in price from around $100 to $1000, not counting tripods.
Today’s Saturday Movie showcase features a variety of modern chronographs. We include comparison tests, as well as video reviews of the new, small-format Bulletseeker Mach 4 and AndiScan Micro A2 Doppler Radar chronographs. If you are in the market for a new chronograph and have the resources, you should definitely consider one of these new small chronos, which are easy to set-up and can be mounted directly to your rifle. For those with a limited budget, MagnetoSpeeds still offer great performance for the price. However, you may have to conduct load tuning separately with the MagnetoSpeed removed.
Triple Chronograph Comparison Test
LabRadar, MagnetoSpeed, and Shooting Chrony Alpha Master
This video has an interesting comparison test with three chronograph devices operating at the same time. A Shooting Chrony Alpha Master unit was set up downrange, while a modern LabRadar was placed to the right side of the rifle. On the barrel of the rifle a MagnetoSpeed chrono was attached. This allowed the tester to compare shot velocity values from all three chrono systems at the same time. The video creator explained: “I was curious to see if my old [Shooting Chrony] chronograph could still give me useful velocity information compared to using the newer MagnetoSpeed and LabRadar.”
Chronograph Functions and Features — Vortex Nation Podcast
In this 78-minute video, experts from Vortex explaining how modern chronographs work. The discussion covers the technical features of various chronographs. Multi-time F-Class National Champion Ian Klemm and former sniper Tony Palzkill examine different chronograph types, explaining how they operate. Ian discusses the pros and cons of different chronograph designs, and provides many good tips for chronograph owners. This 78-minute discussion covers multiple chronograph designs, including LabRadar, MagnetoSpeed, and Caldwell Ballistic Precision. There is also extensive discussion of ballistics in the first 20 minutes.
MagnetoSpeed vs. Caldwell Ballistic Precision Chronograph
In this video the host compares a MagnetoSpeed with an older, first generation Caldwell Ballistic Precision Chronograph, mounted a few yards downrange on a tripod. The tester favored the Magnetospeed saying it was “incredibly accurate” while being much easier to set up and transport. He also says the MagnetoSpeed App was very “user-friendly”.
NOTE: Skip Forward to 5:40 to see the Bulletseeker field-tested as mounted on rifle and on tripods.
The Bulletseeker Mach 4 is a new radar chronograph that mounts directly to your rifle. The advanced Bulletseeker features 120 Ghz radar with a beam-forming lens. Developed in Europe, with made-in-Germany core components, this unit is sold in the USA for $999.00 by Longshot, trusted maker of long-range target cameras. We think this is a game-changer. You get advanced radar ON YOUR GUN, with no need to haul around a bulky LabRadar.
Comparison test with the Bulletseeker Mach 4 and LabRadar
Another Bulletseeker tester was very impressed: “Based on my experiences with the device it seems like a good product that does everything it advertises. All the benefits of a LabRadar without the drawbacks.” (SEE Product review HERE.)
In this video, our friend F-Class John tests the innovative, ultra-compact AndiScan Micro A2 Doppler radar chronograph. This unit is small enough that it can be fitted to your rifle, or attached to a front rest or mini tripod. John tested an early pre-production model. The production model is now available for 800 Euros on the SQI-AndiX eShop. The manufacturer notes: “The next large 2023 production series is expected to be ready by the end of February.”
Product Description: “The AndiScan Micro A2 is an advanced ballistic velocity Doppler radar for measuring muzzle velocity of projectiles. It operates in 24GHz frequency band. It is a highly integrated and extremely small form-factor device that is intended to be directly mounted on the rifle. This frees the user from a complicated setup alignment and it also allows to perform measurements under dynamic conditions. It is the first device [with] this form-factor on the public market.”
JKL Inertial Trigger for LabRadar
The JKL Inertial Trigger for the LabRadar is an easy-to-use, inertial-driven trigger that activates simply from the recoil of your gun. Rather than activate by sound or Doppler reading, the JKL Trigger works from the rifle’s instantaneous recoil pulse when a shot is fired. The unit consists of a small rectangular pad attached to a long audio cable. All you do is plug in the audio cable, attach the pad to your gun with the provided hook and loop (Velcro) material. Then (important), you must change the LabRadar trigger settings from “Doppler” to “Trigger”. The unit works great and is easy to set up.
The text in this article is Copyright 2023 AccurateShooter.com. No site shall reproduce this article without express authorization.
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NRA Media offers a series of informative videos about the Science of Shooting, covering a wide range of topics, from eye dominance to long-range ballistics. These videos feature high production values, with super-slow motion segments, as well as helpful computer graphics to illustrate the principles covered.
The videos are narrated by Jessie Harrison, a top action pistol shooter (and the first women ever to achieve USPSA Grand Master status). Jessie is assisted by talented shooters such as Top Shot Season 4 Champion Chris Cheng. There are 40 videos in the Firearm Science Video Series. Here are seven good NRA science videos, with links to others below.
BULLET TRAJECTORY — Factors at Play and Zeroing Strategies
Host Jessie Harrison (formerly Jessie Duff) and Veteran Air Force Sniper and Long Range Expert George Reinas help us understand the factors behind bullet trajectory. NOTE: There are some exaggerations in the graphics in the videos, and inconsistent terminology use, but it’s still a helpful basic primer on the subject of trajectories. This popular video has over 1 million YouTube views.
Olympic Gold Medalist Jamie Gray demonstrates the four positions used by competition shooters: Prone, Standing, Sitting, and Kneeling. Helpful overlay graphics show how the human skeleton aligns in each of these positions. This video should help hunters as well as competitive position shooters. If you shoot silhouette, definitely watch this video!
INTERNAL Ballistics — Cartridge Ignition and Bullet in Barrel
What happens inside the barrel of your gun when you pull the trigger? In this edition of Firearm Science, Jessie Harrison goes over internal ballistics, which studies the combustion of propellant, the pressure developed, and the motion of the bullet along the bore of the barrel. There are some good 3D animations showing how the powder charge ignites and the bullet moves through the barrel.
CHOKE TUBES and Shot Patterns — Shotgun Science
With over 2 million YouTube views, this shotgun-centric video is the most popular of all the NRA Firearms Science series videos. Here Olympic trap shooter Corey Cogdell explains how choke tubes affect a shotgun’s shot pattern in this edition of Firearm Science. We recommend that all Shotgun hunters watch this video — it explains the effect of choke tubes very well.
ZEROING RIFLES for Long Range — Tech Tips
The process of zeroing rifles for long range is covered in this Firearm Science video featuring George Reinas, a veteran Air Force sniper. George demonstrates how to adjust his scope to compensate for bullet drop at long range. Our friend Dennis Santiago was involved in the making of this video, which was filmed at the Burbank Rifle & Revolver Club in Southern California.
CHRONOGRAPHS — Calculating the Speed of a Bullet
This video shows a conventional chronograph with front and rear light sensors. The bullet first trips the front sensor and then the rear sensor as it flies over the unit. The difference in sensor time is used to calculate bullet speed. This is not the only kind of chrono in common use today. The popular MagnetoSpeed chrono works by tracking the bullet as it passes over two magnetic sensors mounted on a bayonet-style fixture on the barrel.
The high-tech LabRadar chronograph employs Doppler Radar to measure the speed of a bullet without the need to send the round directly over sensors. No need to set up tripods down-range. Just set the unit near your rifle’s muzzle, on the side. There is also an inertial trigger accessory for LabRadars. Interestingly, this video also explains how, in the days before electric lamps, digital processors, and radar, scientists used a mechanical “Ballistic Pendulum” to calculate bullet velocity using Newtonian physics. The Ballistic Pendulum (shown at right) was first used in the mid 1700s.
EYE DOMINANCE — How to Determine Which Eye is Dominant
Host Jessie Duff and longtime shooter Krystie Messenger demonstrate how eye dominance affects aim and teach you how to determine your dominant eye in this edition of Firearm Science. There are very simple tests you can do to determine your eye dominance. This Editor is right-handed but left-eye dominant. All competitive shooters should check for eye dominance. If you are cross-dominant, you can alter your head position or put a paper patch on one frame of your shooting glasses.
Paul Phillips is a past King of 2 Miles, and one of the world’s top Extreme Long Range (ELR) Shooters. He recently showcased one of his ELR rifles that shoots the .416 Barrett cartridge with huge, 550gr Cutting Edge bullets seated in CNC-machined RCC (Robertson Cartridge Company) brass that costs $10 per case.
Even with these giant-sized cartridges, Paul Phillips is getting remarkable accuracy. He recently went out to a snow-covered rifle range to do some testing. We include some test results in this article. Paul’s rig delivered 1.056″ to 1.748″ 3-shot groups at 500 yards. That’s .202 to .335 MOA for three shots. (1 MOA = 1.047″ at 100 yards, or 5.235″ at 500 yards). That’s very impressive accuracy for such a big cartridge with serious recoil.
Confidence is Gained from Consistent Accuracy
Report by Paul Phillips
After being retired from my 30 years of service in military and law enforcement, I started my own company, Global Precision Group LLC. We specialize in Long range shooting. I am currently doing some R&D for a new ammunition company, Ultimate Ammunition, (UA) out of Las Vegas. UA specializes in Military, Law Enforcement, and Custom ammunition.
On this particular day, it was a very cool 15 degrees F. I was testing ammunition for the .416 Barrett. Since winning the King of 2 Miles in 2019, my team has been looking at ways to make everything better. The competition is fierce and everyone is getting better and better. Finding single-digit Standard Deviations (SDs) is a must. Holding SDs under 5 FPS can be what it takes to win.
After several weeks of testing, I think I found the perfect combination for the .416 Barrett in my rifle. My optimal load runs about 3000 FPS using the following components:
Cutting Edge 550 Grain Solid Bullets with Tips
RCC Brass (CNC-machined)
Vihtavuori 20N29 Powder
RWS primers
Loaded for ~3000 FPS load velocity goal
I figure if I can keep my 3-round groups under two inches consistently, I have a chance to win on any Sunday. The average group size of these groups was 1.47 inches at 500 yards. With big bore rifles it gets very costly to test. That is why I am limiting my test groups to 3 rounds. See below:
Note the single-digit Extreme Spread and SD for all of these three-shot groups, as recorded by the LabRadar (see below). The average SD for these three groups at 500 yards was about three.
NOTE: This is an animated GIF with THREE images, alternating every 4.5 seconds.
Not just the ammunition deserves credit. I also have to give credit to the quality Manson reamer, BAT action, Bartlein Barrel, Bix’N Andy trigger, Manners ELR stock, Nightforce Optic, and Accu-Tac bipod with my new P skis. All these gear/hardware items, combined with quality ammunition, allow these kind of groups.
Products featured in this article include:
Accu-Tac Bipods
Bartlein Barrel
BAT Machine Action
Bix’N Andy Trigger
CROSSTAC Shooting Mat
Cutting Edge Bullets
Edgewood Shooting Bag
Kestrel with Ballistics
LabRadar
LongShot Cameras
Manners Composite Stock
Manson Precision Reamer
Nightforce Optics
RCBS Press and Tools
RCC (CNC-machined) Brass
Vihtavuori Powder
Do you own a LabRadar chronograph, or perhaps you are planning to add one to your range gear this season? With a LabRadar, you don’t have to go downrange to set up the chrono on a tripod and fuss with bore-sighting. LabRadars are excellent chronographs, particularly when paired with an inertial trigger.
Here is an excellent accessory that can be easily fitted to LabRadars. This Edelkrone StandONE all-terrain foldable camera stand can provide a stable base when shooting from a bench or the ground. It can quickly and easily adjust to uneven ground so that your LabRadar sits properly vertical and square to the horizon. The versatile Edelkrone StandONE sells for $119.20 at B&H Camera.
Note how the StandONE can adapt to uneven ground through the multiple hinges on the legs.
Forum member X-47B found this stand and he says it works great with his LabRadar. He is a commercial photographer, so he is familiar with the latest and greatest camera stands. In our Shooters’ Forum he posted: “Working in commercial photography and video I come across all different equipment. When I got this Edelkrone StandONE folding base, I realized it is the perfect base for a LagRadar. Works on friction, no ball-head needed. It works on any terrain and folds up tiny, so it’s perfect for prone or the bench.” Stated load capacity is 15 pounds, and this is made to hold expensive camera gear, so there’s no problem placing a LabRadar unit on top.
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High-Quality Portable Base for LabRadar Chronograph
If you currently own a LabRadar, or plan to buy one soon, there’s a smart new accessory you should consider buying. Matt Owens of ArkcoMachine.com offers a great, compact Quad Base for the LabRadar that works better than the flat, orange baseplate offered by the manufacturer.
Matt, aka “Arkcomatt”, explains: “These are machined from aluminum and put together with stainless steel screws. The rubber feet are held on with screws also. No more coming off. The legs have nylon washers between them and the base for smooth operation. The screws are torqued and thread locker applied. One of the best things is, with the standard attachment, it will fit in the case with the unit. No more having to take apart! Just fold the legs. It takes up less room on the bench and allows you to get it closer to the rifle. It is very stable and holds up very well in high winds.” ORDER BASE HERE.
Arkco Machine’s folding Quad Base costs $89.95. The base offers better stability than the LabRadar factory mount, and is also easier to transport because it folds. This makes your LabRadar easier to deploy on a bench or when shooting prone.
Arkco Machine now offers handy swivel (ball) mounts for mounting your LabRadar to Arkco’s Quad Base. Choose either the Quick-Release Heavy-Duty Swivel Mount ($24.95, see photo at right) or the basic Light-Duty Ball Mount, just $10 (shown below). We like the Heavy-Duty unit because it can also be used for spotting scopes.
Arkco Machine also offers stainless spike feet for use when prone shooting. The spikes (shown below) screw in the same holes as the rubber feet.
Forum Member Praise Arkco Machine’s LabRadar Folding Base:
You can read user reviews of the LabRadar Quad Base in this Forum Thread.
Bullet-maker Bart Sauter has one of these bases now and he endorses it: “These bases are great for the LabRadar. Stable and compact — completely grab and go!”
Forum member Peterson1 agrees: “This is more stable than the Labradar base for my use–off a concrete BR bench, yet takes up less space. Also easier/quicker to set unit up and aimed at target. Never take the unit off for transport in LabRadar case. Only negative — you can’t trade in the factory LabRadar base toward purchase of this base. So buy smart the first time!”
Forum Member SkiUtah02 uses the base with optional spiked feet: “Met up with Matt at the Sierra Cup and bought my base with … spikes for the feet to put into the ground. Just had a chance to test it today and it worked great. I removed the rubber feet, and screwed in the four spiked feet, added a threaded-rod-coupling nut onto the bolt so that I could mount an old photography lighting stand swivel head to the base! Worked perfectly. Thanks Matt!”
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Today’s precision shooter is connected. He or she is likely to bring a number of electronic items to the range, such as a smartphone, tablet computer, Kestrel, LabRadar chronograph, and more. These digital devices all require electricity to operate. Unfortunately, most ranges don’t include convenient charging stations for your gadgets. Therefore you need to bring battery back-up. Here are three good options, with storage capacities from 10200 mAh to 42000 mAh. The first unit is fully weather-proof, so it is good for hunters and tactical shooters exposed to the elements. The largest power pack, with AC outlet, is quite versatile and works well on car-camping trips.
1. FosPower 10200 mAh Waterproof Charger, $29.99
When you’re at the range or on a hunt, it’s smart to have a USB-output battery pack for smart phone, target-cam monitor, even a LabRadar. There are many battery packs available, but most are fairly fragile, with exposed ports. This “ruggedized” FosPower 10200 mAh charger is different. It is waterproof, dust-proof, and shock-proof. (IP67 certified: dust and water resistance for up to 3ft/1m for 30 minutes under water.) It can handle all that a PRS competitor or hunter can dish out. It even has a handy LED light. Right now it’s priced at $29.99 with FREE Shipping for Prime members.
2. EasyAcc 20000 mAh Battery Pack with Fast Charging, $42.99
If you want to charge multiple devices, such as a tablet and a LabRadar, you need serious capacity. The EasyAcc 20000 mAh battery pack can charge up to four devices simultaneously. Notably, this $42.99 Battery Pack charges faster than most other 20K packs. It has two power input ports, allowing it to fully charge in 6-7 hours. (We have another 20000 mAh battery unit that takes over 16 hours to fully charge!). This unit will charge an iPhone 7 six times, a Samsung S8 four times or an iPad Mini two times. Note, 78% of Amazon purchasers rated this unit Five Stars (with 13% Four-Star reviews).
3. Jackery 240Wh USB, 110v AC, 12v DC Power Station, $199.99
Many folks have asked us “How can I use a laptop, chronograph, or electronic powder dispenser that requires 110 volt AC power when I’m at the range?” Sure you can take power from your car’s 12 volt cigarette lighter jack, but you’ll still need a very long cable and a 12 volt to 110 volt step-up transformer. If you run a cable from the parking lot to the bench or shooting bay you’ll have to leave a window open in your vehicle and fellow shooters can trip over the long cord.
A better solution is to get a portable, combo USB + 110 volt + 12 volt power unit. This versatile 240Wh Jackery Power Station will drive a 110v device, 12v units, PLUS charge a USB tablet and cellphone, all at the same time. You can run a LabRadar for DAYS with this advanced Lithium Ion power-pack. It will also power CPAP machines and other 12v devices. One nice feature is rapid charging. Before your range session or camping trip, plug this into the wall. It will get fully charged in about 3.5 hours from a 110v outlet. Also this unit can recharge from a paired Jackery solar panel ($179.99 sold separately, see below). By itself (without solar panel) the Jackery portable power source is $199.99 on Amazon. See Jackery Product Store.
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SUMMARY: This article reviews a device that “triggers” the LabRadar chronograph to register bullet speed. Rather than activate by sound or Doppler reading, this $35 JKL Inertial Trigger works from the rifle’s instantaneous recoil pulse when a shot is fired. After some frustration with his LabRadar when shooting at a range with reflective surfaces, our tester is now reporting that 100% of his actual shots are being captured correctly by his LabRadar chrono equipped with the JKL Inertial Trigger. He won’t use his LabRadar without it now. Other users have become instant fans of this inertial LabRadar trigger as well. It is very affordable and it works great. VIEW LARGE PHOTO.
JKL Inertial Trigger for LabRadar Chronograph
Product Review by F Class John
The LabRadar chronograph has been one of the most revolutionary tools in the shooting world because of how it collects velocity data, how it reports (and stores) that data, and, ultimately, the ease with which it can be positioned and operated. However, it’s not a perfect system. A majority of the complaints come from users whose LabRadar’s sometimes fail to record all the shots fired in a string. For the average plinker, this may not be an issue. But for serious shooters trying to do ladder tests or load development requiring all shots to be reported, it can be frustrating when a shot is missed.
Traditionally, LabRadar has recommended trying different settings that compensate for the gap between the unit and muzzle as well as well as having different options for how the unit recognizes a shot fired. While these options work to some degree, they aren’t a guaranteed fix especially when shooting at ranges with concrete baffles or with roofs, walls, and dividers that can alter sound waves. While nobody can precisely explain why shots are lost under certain circumstances, the fact remains it DOES happen. In addition, the default system can sometimes pick up stray shots from nearby rifles.
Not willing to give up on this sophisticated chronograph, many shooters have looked for a foolproof way to prevent such failures from happening. In fact, for this shooter, the frustration was so high that I actually sold my first LabRadar and went back to another chronograph before ultimately buying another LabRadar almost a year later. But I made that repeat purchase only after vowing to finding a way to make the LabRadar work — EVERY time, for EVERY shot.
See How JKL Inertial Trigger Works in this Video
JKL Inertial Trigger — Outstanding Product That Works Great
Enter the JKL Trigger for the LabRadar. This is an easy-to-use, inertial-driven trigger that activates simply from the recoil of your gun. The unit consists of a small rectangular pad attached to a long audio cable. All you do is plug in the audio cable, attach the pad to your gun with the provided hook and loop (Velcro) material. Then (important), you must change the LabRadar trigger settings from “Doppler” to “Trigger”. The unit works great and is easy to set up. In my experience, the unit will activate no matter where you place it on a stock. However the recoil of every gun is slightly different, so you will need to make sure you find a location that doesn’t interfere with your shooting setup.
An unexpected benefit of using the JKL trigger is that it gives you a larger area in which to place your Labradar unit, making it more convenient to setup on benches or range stations. I found this a welcome relief since the LabRadar originally seemed somewhat fussy about where I placed it. Now I can place the LabRadar in more convenient locations — as long as it’s still near my gun and pointed at the target correctly, I get consistent bullet speed data.
Are There Issues with “False Positives”?
If there is any downside to using the JKL Inertial Trigger, it’s that a very hard bump or aggressive working of the action can trigger a false reading. However these are easy to identify in your data, because the speed value is way lower than true fired shot values. Simply remove that low entry or otherwise ignore it in your calculations. To be fair, this “bump activation” really doesn’t happen very often once you get used to using the inertial trigger.
SUMMARY — Outstanding Accessory for LabRadar Users
Bottom line — if you own a LabRadar, then definitely get a JKL Inertial Trigger. Priced at just $35.00 this device is not expensive, yet it’s one of the most effective accessories you can buy for the LabRadar. I’ve recommended these inertial triggers to dozens of shooters. Every one of those guys who did buy a JKL trigger says they can’t imagine using a LabRadar without one. If you love what the LabRadar can do, but have been frustrated with shots not getting recorded 100% of the time, then definitely get yourself a JKL Inertial Trigger. It turns a good system into an amazing system. JKL Industries states that its inertial trigger “will work on anything from a .22 LR to a suppressed system or with standard rifle and brake.”
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NRA Media offers a series of informative videos about the Science of Shooting, covering a wide range of topics, from eye dominance to long-range ballistics. These videos feature high production values, with super-slow motion segments, as well as helpful computer graphics to illustrate the principles covered.
The videos are narrated by Jessie Duff, a top action pistol shooter (and the first women ever to achieve USPSA Grand Master status). Jessie is assisted by talented shooters such as Top Shot Season 4 Champion Chris Cheng. There are over forty videos in the Firearm Science Video Series. Here are five NRA videos, with links to others below. You’ll find all NRA Firearm Science Videos HERE
BULLET TRAJECTORY — Factors at Play and Zeroing Strategies
Host Jessie Duff and Veteran Air Force Sniper and Long Range Expert George Reinas help us understand the factors behind bullet trajectory. NOTE: There are some exaggerations in the graphics in the videos, and inconsistent terminology use, but it’s still a helpful basic primer on the subject of trajectories.
Olympic Gold Medalist Jamie Gray demonstrates the four positions used by competition shooters: Prone, Standing, Sitting, and Kneeling. Helpful overlay graphics show how the human skeleton aligns in each of these positions. This video should help hunters as well as competitive position shooters. If you shoot silhouette, definitely watch this video!
ZEROING RIFLES for Long Range — Tech Tips
The process of zeroing rifles for long range is covered in this Firearm Science video featuring George Reinas, a veteran Air Force sniper. George demonstrates how to adjust his scope to compensate for bullet drop at long range. Our friend Dennis Santiago was involved in the making of this video, which was filmed at the Burbank Rifle & Revolver Club in Southern California.
CHRONOGRAPHS — Calculating the Speed of a Bullet
This video shows a conventional chronograph with front and rear light sensors. The bullet first trips the front sensor and then the rear sensor as it flies over the unit. The difference in sensor time is used to calculate bullet speed. This is not the only kind of chrono in common use today. The popular MagnetoSpeed chrono works by tracking the bullet as it passes over two magnetic sensors mounted on a bayonet-style fixture on the barrel.
The high-tech LabRadar chronograph employs Doppler Radar to measure the speed of a bullet without the need to send the round directly over sensors. No need to set up tripods down-range. Just set the unit near your rifle’s muzzle, on the side. There is also an inertial trigger accessory for LabRadars. Interestingly, this video also explains how, in the days before electric lamps, digital processors, and radar, scientists used a mechanical “Ballistic Pendulum” to calculate bullet velocity using Newtonian physics. The Ballistic Pendulum (shown at right) was first used in the mid 1700s.
EYE DOMINANCE — How to Determine Which Eye is Dominant
Host Jessie Duff and longtime shooter Krystie Messenger demonstrate how eye dominance affects aim and teach you how to determine your dominant eye in this edition of Firearm Science. There are very simple tests you can do to determine your eye dominance. This Editor is right-handed but left-eye dominant. All competitive shooters should check for eye dominance. If you are cross-dominant, you can alter your head position or put a paper patch on one frame of your shooting glasses.
SUMMARY: This article reviews a device that “triggers” the LabRadar chronograph to register bullet speed. Rather than activate by sound or Doppler reading, this $35 JKL Inertial Trigger works from the rifle’s instantaneous recoil pulse when a shot is fired. After some frustration with his LabRadar when shooting at a range with reflective surfaces, our tester is now reporting that 100% of his actual shots are being captured correctly by his LabRadar chrono equipped with the JKL Inertial Trigger. He won’t use his LabRadar without it now. Other users have become instant fans of this inertial LabRadar trigger as well. It is very affordable and it works great. VIEW LARGE PHOTO.
JKL Inertial Trigger for LabRadar Chronograph
Product Review by F Class John
The LabRadar chronograph has been one of the most revolutionary tools in the shooting world because of how it collects velocity data, how it reports (and stores) that data, and, ultimately, the ease with which it can be positioned and operated. However, it’s not a perfect system. A majority of the complaints come from users whose LabRadar’s sometimes fail to record all the shots fired in a string. For the average plinker, this may not be an issue. But for serious shooters trying to do ladder tests or load development requiring all shots to be reported, it can be frustrating when a shot is missed.
Traditionally, LabRadar has recommended trying different settings that compensate for the gap between the unit and muzzle as well as well as having different options for how the unit recognizes a shot fired. While these options work to some degree, they aren’t a guaranteed fix especially when shooting at ranges with concrete baffles or with roofs, walls, and dividers that can alter sound waves. While nobody can precisely explain why shots are lost under certain circumstances, the fact remains it DOES happen. In addition, the default system can sometimes pick up stray shots from nearby rifles.
Not willing to give up on this sophisticated chronograph, many shooters have looked for a foolproof way to prevent such failures from happening. In fact, for this shooter, the frustration was so high that I actually sold my first LabRadar and went back to another chronograph before ultimately buying another LabRadar almost a year later. But I made that repeat purchase only after vowing to finding a way to make the LabRadar work — EVERY time, for EVERY shot.
See How JKL Inertial Trigger Works in this Video
JKL Inertial Trigger — Outstanding Product That Works Great
Enter the JKL Trigger for the LabRadar. This is an easy-to-use, inertial-driven trigger that activates simply from the recoil of your gun. The unit consists of a small rectangular pad attached to a long audio cable. All you do is plug in the audio cable, attach the pad to your gun with the provided hook and loop (Velcro) material. Then (important), you must change the LabRadar trigger settings from “Doppler” to “Trigger”. The unit works great and is easy to set up. In my experience, the unit will activate no matter where you place it on a stock. However the recoil of every gun is slightly different, so you will need to make sure you find a location that doesn’t interfere with your shooting setup.
An unexpected benefit of using the JKL trigger is that it gives you a larger area in which to place your Labradar unit, making it more convenient to setup on benches or range stations. I found this a welcome relief since the LabRadar originally seemed somewhat fussy about where I placed it. Now I can place the LabRadar in more convenient locations — as long as it’s still near my gun and pointed at the target correctly, I get consistent bullet speed data.
Are There Issues with “False Positives”?
If there is any downside to using the JKL Inertial Trigger, it’s that a very hard bump or aggressive working of the action can trigger a false reading. However these are easy to identify in your data, because the speed value is way lower than true fired shot values. Simply remove that low entry or otherwise ignore it in your calculations. To be fair, this “bump activation” really doesn’t happen very often once you get used to using the inertial trigger.
SUMMARY — Outstanding Accessory for LabRadar Users
Bottom line — if you own a LabRadar, then definitely get a JKL Inertial Trigger. Priced at just $35.00 this device is not expensive, yet it’s one of the most effective accessories you can buy for the LabRadar. I’ve recommended these inertial triggers to dozens of shooters. Every one of those guys who did buy a JKL trigger says they can’t imagine using a LabRadar without one. If you love what the LabRadar can do, but have been frustrated with shots not getting recorded 100% of the time, then definitely get yourself a JKL Inertial Trigger. It turns a good system into an amazing system. JKL Industries states that its inertial trigger “will work on anything from a .22 LR to a suppressed system or with standard rifle and brake.”
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At the request of our readers, we provide select “Deals of the Week”. Every Sunday afternoon or Monday morning we offer our Best Bargain selections. Here are some of the best deals on firearms, hardware, reloading components, optics, and shooting accessories. Be aware that sale prices are subject to change, and once clearance inventory is sold, it’s gone for good. You snooze you lose.
1. Amazon — ADDTOP Power Bank with Solar Panels, $39.99
Power — modern shooters need mobile battery power to run a LabRadar, charge a Tablet monitoring a Target Camera, or charge you smartphone running a Ballistics App. Here’s one of the best compact USB-port batteries you can buy. This offers 25000 mAh of energy, PLUS it has four solar panels (one built-in, three external). This ADDTOP Power Bank is on sale now for $39.99 on Amazon, a good deal.
These days, every serious rifleman can really use a tablet computer. Use it with WiFi target-cam systems. Run Ballistics and Reloading Apps. And plug in a $49.99 Teslong endoscope to monitor your bore. This 10″ Samsung Galaxy Tab boasts a 2019 Android OS, long (13-hr) battery life, and easy MicroSD memory boosting. Right now this Samsung is on sale for $147.00 with Free Shipping, a great deal. Or order for $156.99 with 64GB MicroSD card (the BEST DEAL).
3. Cutting Edge Bullets — 25% Off $150+ Orders
Cutting Edge Bullets crafts some of the best-performing projectiles for extreme long range (ELR) shooting. Cutting Edge Solids have set many records. And now you can get these great bullets for 25% OFF. But act soon. This deal is for TODAY ONLY, December 2, 2019. Use Code CYBER19 to get25% OFF all orders over $150.00, with FREE Shipping.
4. Brownells — Electronic Muffs, $24.99 (40% Off)
Brownells new, Second Generation Premium Electronic Earmuffs incorporate dual microphones that let you hear range commmand while suppressing harmful noises. These affordable muffs fold for easy storage, and you can plug your smartphone into the 3.5mm input jack. Right now these muffs are discounted from $41.99 to $24.99 — a 40% savings!
5. Midsouth — Hornady 6.5 Creedmoor Brass and 140gr Bullets
Do you shoot a 6.5 Creedmoor? Well here’s the deal of the year on 6.5 Creedmoor brass and bullets. Get 100 pieces of Hornady 6.5mm Creedmoor Brass for just $34.99. Then add Hornady 6.5mm 140gr ELD Bullets at $64.99/250. That’s just $24.99 per 100, an awesome deal.
The LabRadar is arguably the most sophisticated consumer chronograph on the market. These units rarely go on sale — but here’s your chance. Right now you can now get a LabRadar for $499.95 — that’s $60 off the normal price. (Sale price good through December 2, 2019). Purchase direct from Mylabradar.com, or order for $499.95 from leading vendors Midsouth Shooters, Bruno’s, and Creedmoor Sports.
7. EuroOptic — 15% OFF Nightforce NXS and SHV Scopes
Nightforce Optics makes great scopes for all disciplines. You’ll see Nightforces on the rifles of top benchrest, F-Class, and PRS/NRL competitors. Right now EuroOptic is running a big Nightforce promo. Save 15% on Nightforce NXS or SHV scopes. No rebate forms needed — the 15% savings is processed when you buy.
8. Powder Valley — Free HazMat Through 12/2/2019 — All Brands
Need powder and/or primers? Then head over to Powder Valley. Starting November 29, 2019 (this coming Friday), you can get FREE HazMat for all brands of reloading powders and primers with orders over $179.00. And yes you can combine powder and primers in the same shipment. This FREE HazMat offer runs through December 2, 2019. Go to PowderValleyInc.com and select FREE HazMat during checkout, starting Friday November 29th.
9. SIG Sauer — Huge Optics Sale, up to 60% Off
Now through midnight December 2, 2019, save up to 60% on SIG Sauer riflescopes, red dot sights, rangefinders, binoculars and spotting scopes while supplies last. Choose from 58 different styles. There are some great deals to be had, with prices slashed up to 60%. But ACT SOON, this is a one-day-only sale!
10. Bushmaster Firearms — 50% Off Entire Site Today Only
Bushmaster Firearms is running a big sale today with 50% Savings on uppers, lowers, muzzle brakes, mags, cleaning supplies and more. There are some truly impressive deals. But you better jump on it — the Sale ends 12/2/2019 at 11:59 pm EDT.
11. AREA 419 — CZ 457 MTR Fully Loaded, $950
Tactical-style .22 LR rimfire rifles permit PRS/NRL shooters to cross-train effectively with low-cost ammo. The new CZ 527 MTR is a great platform for a rimfire precision custom. Area 419 has developed a cool 527 MTR-based rig with all the bells and whistles. Area 419’s fully loaded CZ 457 MTR comes complete with an ARCAlock rail, AREA 419 scope base, and Area 419 bolt knob. This is certainly a top choice for a sub-$1000, .22 LR PRS cross-trainer. Buy now and save $170.00.
12. Creedmoor Sports — $10 Off $150+ Orders and Ammo Sale
On Cyber Monday, Creedmoor Sports is offering $10 Off all orders over $150.00, with FREE Shipping. In addition, Creedmoor Sports has discounted its excellent 75gr .223 Rem Ammo. Get 50 rounds for just $30.00. That’s a 32.5% discount off the regular $39.75 price.
We bet most readers own at least one 9mm handgun. Here’s a killer deal on major-brand 9x19mm FMJ ammo — which is fine for general range use and training. The $8.49 price for 50 rounds works out to just seventeen cents ($0.17) per round. At that rate it’s not worth hand-loading, if you value your time at all. Act soon, this deal may expire on 12/2/2019 at 11:59 pm.
14. Palmetto State Armory — Taurus G2c 9mm Pistol, $179.99
This is a good little compact carry gun at a great price. Palmetto State Armory has the black-on-black Taurus 9mm G2c for just $179.99. But it gets even better — with Taurus Factory Rebate your net cost is just $154.99! That’s one of the lowest prices we’ve ever seen for a big name, reliable 9mm handgun. Buy soon before the Rebate Offer expires.
15. Amazon — Jialitte Scope Bubble Level, $10.99
All serious rifle shooters need a scope level. This nicely designed Jialitte Scope Bubble Level features a 30mm milled inside diameter, plus an inner insert ring so it will also fit 1″-diameter main tubes — that dual-diameter versatility is a nice feature. We also like the way the unit is nicely radiused, and has a low profile in the middle. Price is just $10.99 with free shipping. User reviews have been very positive. You could easily pay $35.00 or more for a 30mm scope level.
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At the request of our readers, we provide select “Deals of the Week”. Every Sunday afternoon or Monday morning we offer our Best Bargain selections. Here are some of the best deals on firearms, hardware, reloading components, optics, and shooting accessories. Be aware that sale prices are subject to change, and once clearance inventory is sold, it’s gone for good. You snooze you lose.
1. Bullet Central — Lapua Brass Sale
We’re coming up on the end of the year and that means it won’t be long until it’s time for matches. Get ahead during the off season by taking advantage of the Lapua brass sale at Bullet Central. It’s smart to buy your brass for the 2020 season now, so you can do your brass prep and loading during the winter months.
The LabRadar is arguably the most sophisticated consumer chronograph on the market. These units rarely go on sale — but here’s your chance. Right now you can now get a LabRadar for $499.95 — that’s $60 off the normal price. (Sale price good through December 2, 2019). Purchase direct from Mylabradar.com, or order from leading vendors Midsouth Shooters (in-stock $499.95), Bruno’s (back-order $499.95), and Creedmoor Sports ($499.95 in stock).
3. Brownells — Giant Ammo Clearance
You can find discounts on certain ammunition brands at various vendors, but we’ve never seen a huge clearance like this with so many ammo types on sale. Take some time to check out all the amazing Ammo Clearance Deals now at Brownells. Over 1800 products are clearance priced so there’s sure to be something for everyone.
4. Natchez — Holiday Discount Codes, Save $10, $25, $40
Right now you can get direct money OFF nearly all products at Natchez Shooters Supply. Save $10 on purchases of $100 or more with CODE D191118A, or save $25 on $200 with CODE D191118B, or save a full $40 (13.3%) on orders of $300 or more with CODE D191118C. You must act soon, however, as these Discount Codes expire at 11:59 pm November 20, 2019. Some restrictions apply.
5. Field & Cave Outfitters — Silhouette Targets, up to 40% off
If you’re tired of shooting at paper targets, check out these sturdy varmint benchrest silhouette targets from Field & Cave Outfitters. There are a variety of animals to choose from. Right now you can save up to 40% off on these quality steel silhouette targets. The Prairie Dog and Armadillo are laser-cut and bent 18ga cold-rolled steel. The Coyote and Hog are 3/8″-thick AR500 steel, laser- cut then welded.
Here’s a great deal for those looking to either add a handgun to their collection or for those just getting started in the shooting sports. We found the Ruger Security-9 in 9mm for a great price of $279.99. Under $280 for a reliable, sturdy Ruger 9mm — that’s a smart choice for personal defense. This features a blued steel slide, 4″ barrel, polymer frame, and 15-rd magazine.
7. Amazon — Padded Shooting Mat, $37.99
Are you new to prone shooting or tired of using an old worn out mat? Grab one of these Redneck Convent padded shooting mats and you shoot in style and comfort all day long. These pads are weather, chemical and water resistant and the durable PVC material is easy to clean and maintain. Best of all it rolls up for easy storage and transport.
8. Midsouth — Frankford Arsenal Vibra Prime, $39.99
Do you still load up your priming tubes the old fashion way, one at a time out of a flip tray? Save yourself time and trouble with the Frankford Arsenal Vibra Prime Primer Tube Loader. This tool loads a universal primer tube in just seconds and can transfer the primers to just about any brand primer tube just as easily. We’ve used one of these for years without Hornady, RCBS and Dillon tubes without any issues.
9. Amazon — Waterproof Clipboard, $19.98
Planning on hitting the range or that next match but the forecast says there might be a few showers? Fear no more as you can grab one of these waterproof clipboards and keep your load data notes or your shooting partners scores safe and dry. We keep one of these with us anytime we go to a match because you can flip it over and use it as a regular clipboard when it’s dry too!
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We see comparison tests of cars, cameras, and other hardware. But how about chronographs? What could we learn by setting up three different chronographs, and running a 20-shot string over all three at the same time. One of our Forum members, Randy S. (aka AAA) did that very test with three of the best chronographs you can buy: LabRadar, MagnetoSpeed, and an Oehler model 35P. The MagnetoSpeed was attached to the barrel of an F-Class rig, with the LabRadar placed on the left side of the shooting bench. The Oehler 35P was positioned about 23 feet downrange. The photo above shows the set-up. A 20-shot string was recorded with the results in a spreadsheet.
AAA talks about this interesting experiment in a Shooters’ Forum Thread. Here is his report:
Comparison Testing Three Chronographs
We all have our favorite chronograph. Each gives a number, but how would that number compare to the same round fired with another chronograph? I wanted to know so a friend and I set up the following test with three chronographs: LabRadar, MagnetoSpeed V3, and Oehler Model 35P.
For the test we fired Berger 105gr VLDs over the three chronographs simultaneously. The test rifle was my 6mm BR Ackley (BRA) F-class rig with fire-formed brass and 200 rounds on the new barrel.
Chronogaphs Tested
LabRadar
MagnetoSpeed V3
Oehler Model 35P
Temperature: 86 deg. F
Elevation: 854 feet
Cartridge: 6mm BRA (105gr Berger VLD)
Time between shots: 45 seconds
To start off, five rounds were fired to make sure all systems were recording and to warm the barrel. Then the test was 20 shots fired across all three instruments with 45 seconds between shots. The Oehler was set 7.5 yards from the muzzle so 12 FPS was added to the recorded value.
We were using the internal trigger on the LabRadar. The manual says the Vo indicated is the actual muzzle velocity when using the internal trigger, but not if using the Doppler. The 12 FPS Oehler adjustment (back to MV) was based on the Berger Ballistics Calculator.
The LabRadar Chronograph is on sale now through 12/7/2019. Buy for $499.95, a $60.00 savings.
Results of the Triple Chronograph Shoot-Out:
LR-M is FPS variance between LabRadar and MagnetoSpeed V3. LR-O is FPS variance between LabRadar and distance-adjusted Oehler 35P. You can see all three chronos were very consistent. ES was identical with the MagnetoSpeed and Oehler 35P, while SD was identical with the LabRadar and Oehler 35P.CLICK HERE for spreadsheet.
The tester, Randy S. (aka AAA) says: “Judge for yourself, but I was impressed by all.”
This is a manufacturer’s photo showing the Magnetospeed V3 as mounted. This is NOT the test set-up.
Comments by Forum Members
Our Forum members expressed interest in this Triple Chronograph test. Some confirmed that the LabRadar and Magnetospeed give very similar FPS numbers, based on their own tests:
“Great test and thanks for sharing. I’ve tested my MagnetoSpeed and LabRadar together and results are always within 2-4 FPS of one another.” — Big D
“Very happy to see your numbers support my decision to buy a MagnetoSpeed. Had read reports comparing it to the Oehler and the numbers I get seem to be supported by my long range shooting results. Many thanks for taking the time and effort [to perform] this comparative test. Always good to get actual test results.” — Texas10
“I did a 4-shot test with my MagnetoSpeed and another shooter’s LabRadar a couple of days ago. The results were within 4 fps with the LabRadar being optimistic.” — Pat Miles
Forum Member Powderbreak studied AAA’s original spreadsheet from the chronograph trio test, then figured out the shot-by-shot FPS variance between the machines. He concluded that all the machines performed very well. Powderbreak posted:
Analyzing the Triple Chronograph Test — What Can We Conclude?
AAA did a great job of comparing the 3 chronos. What conclusions can be drawn?
1) I have not checked the manufacturer’s claims of accuracy, but the three chronos are very close to one another. There is no way for us to determine the actual true velocities, but we do not need to do so. Any of the chronos would be more than adequate for an accurate shooter.
2) The resolution of the three chronographs is actually pretty astounding. One foot per second (FPS) is a resolution of 0.033%.
3) AAA did a great job of reloading a very consistent round. With an extreme spread of 33 fps out of 3014 for 20 rounds, that is only 1.09% total spread of velocities.
4) There is a closer velocity match between the MagnetoSpeed and the LabRadar, but that does not mean the Oehler is less accurate. There is simply an offset between the Oehler and the other two. This could be due to the greater distance, the location, or the internal working of the Oehler.
5) Believe your chronograph, it is probably the most accurate reloading tool that you own.
Brian Litz of Applied Ballistics carefully explained the operation, set-up, accuracy and comparison of AB’s chronographs in his books. [Those books] are well worth the money, and give great insight into the workings of chronographs.” — Powderbreak
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Today’s precision shooter is connected. He or she is likely to bring a number of electronic items to the range, such as a smartphone, tablet computer, Kestrel, LabRadar chronograph, and more. These digital devices all require electricity to operate. Unfortunately, most ranges don’t include convenient charging stations for your gadgets. Therefore you need to bring battery back-up. Here are three good options, with storage capacities from 10200 mAh to 42000 mAh. The first unit is fully weather-proof, so it is good for hunters and tactical shooters exposed to the elements. The largest power pack, with AC outlet, is quite versatile and works well on car-camping trips.
1. FosPower 10200 mAh Waterproof Charger, $29.99
When you’re at the range or on a hunt, it’s smart to have a USB-output battery pack for smart phone, target-cam monitor, even a LabRadar. There are many battery packs available, but most are fairly fragile, with exposed ports. This “ruggedized” FosPower 10200 mAh charger is different. It is waterproof, dust-proof, and shock-proof. (IP67 certified: dust and water resistance for up to 3ft/1m for 30 minutes under water.) It can handle all that a PRS competitor or hunter can dish out. It even has a handy LED light. Right now it’s priced at $29.99 with FREE Shipping (on orders over $25.00).
2. EasyAcc 20000 mAh Battery Pack with Fast Charging, $37.99
If you want to charge multiple devices, such as a tablet and a LabRadar, you need serious capacity. The EasyAcc 20000 mAh battery pack can charge up to four devices simultaneously. Notably, this $37.99 Battery Pack charges faster than most other 20K packs. It has two power input ports, allowing it to fully charge in 6-7 hours. (We have another 20000 mAh battery unit that takes over 16 hours to fully charge!). This unit will charge an iPhone 7 six times, a Samsung S8 four times or an iPad Mini two times. Note, 77% of Amazon purchasers rated this unit Five Stars (with 13% Four-Star reviews).
3. Webetop 42000 mAh USB, 12v DC, 110v AC Power Station, $108.99
Many folks have asked us “How can I use a laptop, chronograph, or electronic powder dispenser that requires 110 volt AC power when I’m at the range?” Sure you can take power from your car’s 12 volt cigarette lighter jack, but you’ll still need a very long cable and a 12 volt to 110 volt step-up transformer. If you run a cable from the parking lot to the bench or shooting bay you’ll have to leave a window open in your vehicle and fellow shooters can trip over the long cord.
A better solution is to get a portable, combo 12 volt + 110 volt power unit. This versatile 42000 mAh Webetop Power Station will drive a 110v device, plus charge a tablet and cellphone, all at the same time. You can run a LabRadar for days with this power-pack. It will also power CPAP machines and other 12V devices. One nice feature is rapid charging. Before your range session or camping trip, plug this into the wall. It will get fully charged in 7-8 hours. It’s a bargain right now for $108.99 on Amazon.
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This video shows a conventional chronograph with front and rear light sensors. The bullet first trips the front sensor and then the rear sensor as it flies over the unit. The difference in sensor time is used to calculate bullet speed. This is not the only kind of chrono in common use today. The popular 
After several weeks of testing, I think I found the perfect combination for the .416 Barrett in my rifle. My optimal load runs about 3000 FPS using the following components:
Arkco Machine’s 
