Bryan Litz has produced an informative new video on the subject of bullet stability. The video explains how stability is related to spin rate (or RPM), and how RPM, in turn, is determined by barrel twist rate and velocity. For long-range shooting, it is important that a barrel have a fast-enough twist rate to stabilize the bullet over its entire trajectory.
Detailed Bullet Stability Article
To complement the above video, Bryan has authored a detailed article that explains the key concepts involved in bullet stabilization. Bryan explains: “Bullet stability can be quantified by the gyroscopic stability factor, SG. A bullet that is fired with inadequate spin will have an SG less than 1.0 and will tumble right out of the barrel. If you spin the bullet fast enough to achieve an SG of 1.5 or higher, it will fly point forward with accuracy and minimal drag.”
There is a “gray zone” of marginal stability. Bryan notes: “Bullets flying with SGs between 1.0 and 1.5 are marginally stabilized and will fly with some amount of pitching and yawing. This induces extra drag, and reduces the bullets’ effective BC. Bullets in this marginal stability condition can fly with good accuracy and precision, even though the BC is reduced. For short range applications, marginal stability isn’t really an issue. However, shooters who are interested in maximizing performance at long range will need to select a twist rate that will fully stabilize the bullet, and produce an SG of 1.5 or higher.”
Berger Twist-Rate Stability Calculator
On the updated Berger Bullets website you’ll find a handy Twist-Rate Stability Calculator that predicts your gyroscopic stability factor (SG) based on mulitiple variables: velocity, bullet length, bullet weight, barrel twist rate, ambient temperature, and altitude. This very cool tool tells you if your chosen bullet will really stabilize in your barrel.
LIVE DEMO BELOW — Just enter values in the data boxes and click “Calculate SG”.
Top photo with bullet by Werner Mehl, www.kurzzeit.com, all rights reserved.
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If you have been waiting to acquire a chronograph, it may be time to buy. Brownells.com now has the popular new MagnetoSpeed Sporter Chronograph in stock for just $179.99. This Sporter model shares most of the capabilities of the $399.00 MagnetoSpeed V3, but at a much, much lower cost. Like all MagnetoSpeeds, the Sporter is easy to set up. Just attach the unit to your barrel with a strap and toggle clamp. There is no need to go downrange to set up tripod and skyscreens, or run wires.
We’re impressed by the Sporter chrono (as are other shooters — this unit is selling out nationwide). Like the V3, the Sporter faithfully records shots, even in complete darkness. Shot strings are recorded digitally and can be transferred to a smart phone via MagnetoSpeed’s XFR accessory (and Apps).
What’s the downside? The manufacturer says the Sporter is limited to 1″-max diameter barrels. In actuality, it can go a bit bigger than that. We have used it successfully on a 1.15″ straight contour barrel — but “your mileage may vary”. Second, the manufacturer says the new Sporter is NOT designed for use with airguns or shotguns. We have tested the original MagnetoSpeed with air rifles and it successfully recorded .177 and .22 pellet velocities, once we adjusted the sensitivity.
This Video Shows How to Use the Magnetospeed Sporter Display
Here is the XFR Device that allows Sporter and V3 chronos to work with smartphone Apps:
With MagnetoSpeed’s $24.99 XFR adapter and associated Apps, you can download your current shot series from Sporter and V3 chrono displays to an Android or iOS device. Once synced, users can rename the current shot series, delete irrelevant shots, email the data, reconfigure the display settings (units and sensitivity level), and clear the display’s current series.
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With barrels, one wonders “Can a little more length provide a meaningful velocity gain?” To answer that question, Rifleshooter.com performed an interesting test, cutting a .308 Win barrel from 28″ all the way down to 16.5″. The cuts were made in one-inch intervals with a rotary saw. At each cut length, velocity was measured with a Magnetospeed chronograph. To make the test even more interesting, four different types of .308 Win factory ammunition were chronographed at each barrel length.
Test Barrel Lost 22.7 FPS Per Inch (.308 Win Chambering)
How much velocity do you think was lost, on average, for each 1″ reduction in barrel length? The answer may surprise you. With a barrel reduction from 28″ to 16.5″, the average speed loss of the four types of .308 ammo was 261 fps total. That works out to an average loss of 22.7 fps per inch. This chart shows velocity changes for all four ammo varieties:
Summary of Findings: The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. By ammo type, the average loss per inch was: 24.6 (Win 147 FMJ), 22.8 (IMI 150 FMJ), 20.9 (Fed GMM 168gr), and 22.5 (Win 180PP).
Interestingly, these numbers jive pretty well with estimates found in reloading manuals. The testers observed: “The Berger Reloading manual says for the 308 Winchester, ‘muzzle velocity will increase (or decrease) by approximately 20 fps per inch from a standard 24″ barrel’.”
How the Test Was Done
The testers described their procedure as follows: “Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. Average velocity and standard deviation were logged for each round. Since we would be gathering data on 52 different barrel length and ammunition combinations and would not be crowning the barrel after each cut, we decided to eliminate gathering data on group sizes. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. The barrel was cut off using a cold saw. The test protocol was repeated for the next length. Temperature was 47° F.”
CLICK HERE to Read the Rifleshooter.com Test. This includes detailed charts with inch-by-inch velocity numbers, multiple line charts, and complete data sets for each type of ammo. Rifleshooter.com also offers ballistics graphs showing trajectories with different barrel lengths. All in all, this was a very thorough test by the folks at RifleShooter.com.
Much Different Results with 6mmBR and a Longer Barrel
The results from Rifleshooter.com’s .308 barrel cut-down test are quite different than the results we recorded some years ago with a barrel chambered for the 6mmBR cartridge. When we cut our 6mmBR barrel down from 33″ to 28″, we only lost about 8 FPS per inch. Obviously this is a different cartridge type, but also our 6mmBR barrel end length was 5″ longer than Rifleshooter.com’s .308 Win start length. Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). Powder burn rates can also make a difference.
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Sporter Chronograph Kit includes: Bayonet Sensor, 3.5 foot Data Cable, Remote Display (with Battery), Strap with thumb nut, Two V-block spacers, and compact storage box.
Magnetospeed has just introduced a new bayonet-style chronograph that is less than half the price of previous MagnetoSpeed models. This is big news for shooters who always wanted a MagnetoSpeed but found the $399.00 cost (for V3 model) too pricey. The new Sporter Chronograph will cost just $189.00. It offers most of the features of the more expensive models (see chart below for details) and has a updated sensor. The MagnetoSpeed Sporter chronograph kit was designed to be used on barrels from 1/2 inch up to 1 inch in diameter. In can also accommodate muzzle brakes and flash hiders up to 2.7 inches in length. MagnetoSpeed says its new Sporter is “Ideal for contoured rifle barrels (sporter barrels) and long-barreled revolvers.”
See $189.00 Sporter Chronograph Features Reviewed in Video
MagnetoSpeed Sporter features
Simple, one-button cycling display (shows recent shot velocity and statistics).
Three sensitivity settings for fine-tuning.
Easy access battery compartment, with 9V Battery included.
Integral, quick-attachment system, with metal buckle, nylon strap, screw-in tensioner, and dual V-block spacers (thick and thin).
Bayonet works with Muzzle Brakes and Flash-hiders up to 2.7″ long.
Q: Will the Sporter Chrono work with thicker barrel (i.e. greater than 1″ diameter)?
A: The manufacturer recommends the $399.00 V3 model for thicker barrels. But, wink-wink, if you have a 1.25″ barrel you can get this to work, based on what we’ve seen. If you need to go really fat (up to 2.0″ diameter), get the V3. Magnetospeed also says the V3 is needed for airguns, shotguns, and muzzleloaders.
Click Image for Full-Screen Photo
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The new-for-2014 Caldwell Crosswind Professional Wind Meter does much more than measure wind velocity. Along with Current Wind Speed, this device will measure and display: Average Wind Speed, Max Wind Gust, Temperature, Station Pressure, Barometric Pressure, Altitude, Density Altitude and even Wind Chill factor. Select among mph, ft/min, km/h, m/s, or knots for the wind speed units.
The swiveling impeller head (set parallel to barrel) allows you to determine an interpolated 90° crosswind value to use in your ballistics calculations. This eliminates a lot of guesswork.
You might say, “Why do I need a rotating head, I can just turn the whole wind meter to align the impeller axis with the wind?” Yes you can, but then you merely get a raw speed value, and you have to guesstimate the wind angle, and then calculate your actual windage correction based on the vector.
The rotating impeller ring on the Caldwell simplifies the job of calculating windage. The swivel head is designed to show an effective 90-degree crosswind value, no matter what the actual wind direction. Here’s how it works. Hold the unit with the display screen facing you. Then rotate the impeller head until it aligns with the barrel axis (bullet line of flight). The plastic shell surrounding the impeller is specifically designed so that the blades will spin faster or slower depending on the true wind angle. This allows the unit to estimate the effective 90-degree crosswind value (for your ballistics program). Pretty clever eh? See diagram to understand how this works:
This unit comes complete with rotating anemometer head, protective holster case, and one CR2032 battery. The unit has an auto “Power-Off” feature to preserve battery life. There is also a “Data Hold” function plus an LCD Backlight. NOTE: When figuring effective 90° crosswind values, Caldwell recommends using Average Wind Speed mode rather than Current Wind Speed.
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Put the same load in a variety of barrels (with the same length and chamberings) and you’ll see a wide variance in muzzle velocity. In fact, it’s not unusual to see up to 100 fps difference from one barrel to the next. We demonstrated this with a comparison test of Lapua factory ammo.
Chron Testing Lapua Factory Ammo
At our Southern California test range, we chronographed Lapua 105gr 6mmBR factory ammo in three different 8-twist barrels of similar length. The results were fascinating. Lapua specs this ammo at 2790 fps, based on Lapua’s testing with its own 26″ test barrel. We observed a speed variance of 67 fps based on tests with three aftermarket barrels.
Brand ‘S’ and Brand ‘PN’ were pre-fit barrels shot on Savage actions. Brand ‘K’ was fitted to a custom action. All test barrels were throated for the 100-108 grain bullets, though there may have been some slight variances in barrel freebore. With a COAL of 2.330″, the rounds were “jumping” to the rifling in all barrels. Among the four barrels, Brand ‘PN’ was the fastest at 2824 fps average — 67 fps faster than the slowest barrel. Roughly 10 fps can be attributed to the slightly longer length (27″ vs. 26″), but otherwise this particular barrel was simply faster than the rest. (Click Here for results of 6mmBR Barrel Length Velocity Test).
Results Are Barrel-Specific, Not Brand-Specific
These tests demonstrate that the exact same load can perform very differently in different barrels. We aren’t publishing the barrel-makers’ names, because it would be wrong to assume that ‘Brand X’ is always going to be faster than ‘Brand Y’ based on test results from a single barrel. In fact, velocities can vary up to 100 fps with two identical-spec barrels from the SAME manufacturer. That’s right, you can have two 8-twist, 26″ barrels, with the same land-groove configuration and contour, from the same manufacturer, and one can be much faster than another.
Don’t Demand More Than Your Barrel Can Deliver
We often hear guys lament, “I don’t get it… how can you guys get 2900 fps with your 6BRs and I can only get 2840?” The answer may simply be that the barrel is slower than average. If you have a slow barrel, you can try using more powder, but there is a good chance it may never run as fast as an inherently fast barrel. You shouldn’t knock yourself out (and over-stress your brass) trying to duplicate the velocities someone else may be getting. You need to work within the limits of your barrel.
Factory Ammo Provides a Benchmark If you have a .223 Rem, 6BR, .243 Win, 6.5×47 Lapua, 6.5×55, .308 Win, 30-06, or 300 WM Rifle, we recommend you buy a box of Lapua factory-loaded ammo. This stuff will shoot great (typically around half-MOA), and it can give you a baseline to determine how your barrel stacks up speedwise. When you complete a new 6BR rifle, it’s wise to get a box of the factory ammo and chronograph it. That will immediately give you a good idea whether you have a slow, average, or fast barrel. Then you can set your velocity goals accordingly. For example, if the factory 6BR ammo runs about 2780-2790 fps in your gun, it has an average barrel. If it runs 2820+ in a 26″ barrel (or 2835 fps in a 28″), you’ve got a fast tube.
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Here’s good news for owners of Shooting Chrony Chronographs — you can purchase a Chrony LED Lamp (CLL) upgrade kit that allows your Chrony to work indoors. In addition, the new LED illuminators will enhance outdoor performance in uneven or shaded lighting conditions. The CLL kit costs $87.95 and can be ordered directly from the Shooting Chrony Website, or from vendors such as MidwayUSA.com.
Why the LED Illuminator Kit Is Needed
Shooting Chronys are popular “entry-level” chronographs. They are inexpensive to purchase and they stow compactly with their signature “folding box” design. This Editor used a Shooting Chrony (Beta Master model) for a few years with generally good results. However, I quickly learned that the Shooting Chrony gave the most reliable readings in diffuse mid-morning light with mildly overcast skies (thin cloud layer). The unit did not like to work in the late afternoon with the sun at a low angle. Likewise, uneven, shady conditions caused problems. In summertime, the ultra-bright, noontime summer sun, directly overhead, seemed to “over-power” the diffusers, causing errors. So, I learned to do my speed tests only when conditions were most favorable for the Shooting Chrony. Now, admittedly, not all Shooting Chronys are so temperamental — I’ve seen a few that worked great in bright overhead sunlight. But most Shooting Chronys do seem to struggle with shady conditions or low-angle sunlight.
LED Lamp Kit Components and Accessories
To improve Shooting Chrony reliability in all light conditions, Shooting Chrony offers a $87.95 LED kit (Item #110) that comes with LED-equipped 14″ white diffusers mounted on 16″ wire support rods. The LEDs provide a constant, consistent light source, so you can shoot in the late afternoon and evenings. The kit includes a 120V/220V AC Adapter, output 12VDC @500mA. If AC power is not available, you can run the LED Lamp with an optional 12v dc “Power Station” battery pack (Item #111, $47.95), or you can draw 12v current through an available cigarette lighter-style adapter (Item #112, $10.00).
LED Kit Users Say It Works
We haven’t tested the LED kit ourselves yet, but here’s what one kit buyer had to say:
“If you shot in poor light, you are going to miss velocities no matter what chronograph you are using. You go to all the work of assembling your handloads, set up the chronograph, and then shoot at the target through the detectors… only to get ‘Err 2′ or ‘Err 9′ and use up most or all of the carefully assembled handloads without getting any velocity data. The Chrony LED Lamp assembly has been perfect. Bright sun/no clouds, hazy/cloudy, or shadows/shade makes no difference — all the readings come through without a single ‘Err X’ code. Current draw is also surprisingly low. With the C.L.L. on for five straight hours, the battery pack still shows a full charge.”
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There’s a lot of buzz about ballistics programs for smartphones. Those are handy, to be sure, but most people still need a solid, full-featured program to run on their home computers. Berger Bullets offers a sophisticated ballistics programs for MS Windows computers that works really well, and lets you print out results. Up-to-Date G7 BCs for Berger projectiles are built-in to the program, and the price is right — FREE.
The program is basic enough to be easy to use, but flexible enough to allow you to calculate custom ballistics for your rifle and load. The program accounts for all the basic external ballistic parameters including bullet BC and muzzle velocity, atmospherics, uphill/downhill shooting, etc. The output tabulates velocity, energy and time of flight as a function of range. Bullet path and wind deflection are displayed in your choice of inches, centimeters, MOA or MILS.
Instructions for Program
On the Berger Bullets Blog (1/26/2010), You’ll find a description of program features and a complete set of instructions. Here are instructions for the bullet variables: “The bullet inputs are straightforward. The BC can be entered in reference to either the G1 or G7 standard. You can find the G1 or G7 BC for your bullet either printed on the bullet box label, or on our products page. For accurate results, you should measure the muzzle velocity with a good chronograph. If you don’t have access to a chronograph, you can estimate the muzzle velocity based on your load data.”
Tips for Best Results
Bryan Litz includes tips on getting the most from the Berger Ballistics program. Some of Bryan’s suggestions will also help you when working with other ballistics software:
G1 vs. G7 BC: The accuracy of the ballistic solution is only as accurate as the inputs you give it. The advertised BCs for Berger bullets are established by actual field firing tests over long range and are very accurate. Using the properly referenced BC (G7 vs. G1) for the bullet you’re modeling is important. For any bullet with a boat tail, we recommend using the G7 BC.
Muzzle Velocity: Knowing your true muzzle velocity is important when calculating external ballistics. It’s best to measure your muzzle velocity directly with a chronograph.
Altitude and Atmosphere: If you want a truly accurate long-range trajectory prediction, you can’t ignore atmospheric effects. This is especially true the farther you get from standard conditions (sea level altitude, 59 degrees Fahrenheit, 0% humidity).
Scope Verification: It’s important to verify the most important link between the calculated ballistics and your point of impact: your scope. If the ballistics program calculates 30.0 MOA of drop for a particular shot, and you dial your scope to 30.0 MOA, are you sure it’s giving you exactly 30.0 MOA? In reality, many scopes have enough error in them to cause misses at long range. It’s important to verify the value of your scope clicks by firing groups at short range.
If you have further questions not answered on Berger’s Blog Page, email Bryan.Litz [at] bergerbullets.com. NOTE: If your computer won’t run the program, please download and install this Java update: http://www.java.com/en/download/index.jsp. This is a Windows PC program. You may have problems trying to run it on a MAC in emulation.
Story sourced by Edlongrange.
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Many folks have been anxiously awaiting the release of Hodgdon’s new Superformance and LeveRevolution powders, high-velocity blended propellants originally developed by Hornady. For select cartridge types, Hornady claims, these new blended spherical powders can deliver 80 to 150 FPS more velocity than other powders on the market.
Well wait no more — Superformance and LeveRevolution powders are both IN STOCK at Grafs.com now. Both 1-lb and 8-lb containers are in stock. If you’ve been wanting to experiment with either of these new powders — get yours before it’s gone. Supplies are limited.
If you want to win shooting matches you’ll need to gauge wind speed and direction. While many shooters use the excellent Kestrel line of pocket Weather Trackers, many top shooters are turning to the Windtronic 2, a German-made unit that measures wind speeds from any direction.
The Windtronic features rotating cups mounted on a vertical axis. With this design you don’t have to align the unit with the wind, unlike the Kestrel WindMeter or SpeedTech WindMate™ devices. Many users feel the Windtronic’s unique design allows it to read wind speeds more accurately; it certainly can respond to shifting winds more easily. The omni-directional functionality of the Windtronic allows it to be mounted on a stand or tripod and continuously display current wind speed, max wind speed, and average velocity.
The Windtronic 2 doesn’t guage temperature, barometric pressure, humidity, or density altitude, unlike the more advanced (and expensive) Kestrel 4000/4500 model pocket weather trackers. The Windtronic only records wind speeds, but it does that one task exceptionally well.
Made in Germany by Kaindl Electronics, the Windtronic 2 comes with a 2-year manufacturers warranty and normally retails for $99.00 on Amazon.com. Other dealers include Windtronic.us and Windpowersports.com.
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You may have heard rumors about a new 100gr projectile from Berger Bullets. Eric Stecker, Berger’s Master Bulletsmith, confirmed that there will be not one but TWO new 100gr match bullets coming soon from Berger, one in 6mm and one in 6.5mm. These are both boat-tail designs using J4 jackets. Eric explains: “Both these bullets are based on Berger’s proven designs, with standard length ogives and 9° boat-tails. Nothing radical. They are built in response to shooters’ requests to expand our bullet line-up to include new weight options in 6mm and 6.5mm.”
New 100gr 6.5mm Bullet for High Power
Berger’s new 6.5mm 100gr BT Target projectile provides a low-recoil, lighter-weight option for target rifle shooters using the 6.5×47 Lapua, 6.5 Creedmoor, 260 Rem, and 6.5-284 cartridges. The new 6.5mm 100-grainer was created in response to requests from High Power and Across-the-Course shooters for a lighter-recoiling, accurate boat-tail bullet for “short line” work. We predict this bullet may also work well for varmint and small-game hunters. This bullet features a short boat-tail and a “mildly secant” design which should work well either seated into the lands or jumped away from the lands. Bryan Litz says: “it’s definitely not a VLD, but it has a different ogive curve than a typical tangent-ogive bullet.” The shorter length of the 100gr bullet, compared to 140gr-class 6.5mm bullets, should also allow tactical shooters to easily load their ammo to mag length. The calculated BC of the new bullet is 0.370, significantly higher than flat-based 100gr 6.5mm bullets from other manufacturers. A minimum twist rate of 1:10” is recommended for Berger’s hew 6.5mm 100gr Target Bullet.
New 100gr 6mm Match Bullet — More Velocity Than 105/108
Long-range benchresters have had great success with the Berger 108gr match bullet, introduced in 2007. Given the popularity of its tangent-ogive 108, Berger has been developing a shorter, lighter version, which can shoot faster than the 108 in small cartridges such as the 6mmBR, 6mmAR (6-6.5 Grendel), and 6 PPC. The new 6mm 100-grainer will be very similar to the 108. The 100 has the same ogive curve and boat-tail as the 108 but has a shorter OAL and shorter bearing surface (0.368″ vs. 0.409″). A minimum twist rate of 1:8” is recommended for the new 100 — same as for the 108. In a 6BR rifle, the 100-grainer’s reduced bearing surface, combined with reduced mass, should enable Berger’s new 100gr 6mm bullet to fly 50-70 fps faster than the 108 (with charges of equal pressure).
However, there is a trade-off. Being shorter and lighter, the 100-grainer has a lower BC compared to its 108gr big brother. While the Berger 108 has a 0.511 BC, the calculated BC for the 100-grainer is 0.475. That BC difference will show up at long range, but the extra speed of the lighter bullet may enable it to reach a higher, optimal “velocity node” which may deliver superior accuracy in some rifles. We will be testing the new 100-grainer soon. In a 6BR that might max out at 2850 fps with the 108s, we predict the 100gr Berger should run close to 2900 fps. In a 6BR that delivers 2900 fps currently with the 108s, you may see 2950 fps (or more) with the new Berger 100s. The 2900-2950 fps speed range is a well-known “accuracy node” for both 6mm and 6.5mm bullets.
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Alliant’s new Reloder 17 powder is the new “Speed King” in its burn-rate category. It promises to raise the velocity bar in many cartridges which work best with slow-burning propellants. Based on initial test results, if you’re using H4350, IMR4350, Reloader 19, Norma URP, or H4831 currently, you may find that RL17 can deliver dramatically higher velocities than other powders. CLICK HERE for FULL REPORT.
RL17 Boosts Speeds by 200 fps
The day after two pounds of RL17 arrived in Phoenix, German Salazar and Bob Jensen tried the new propellant in 6XC and .308 rifles, using an Oehler 43 chronograph equipped with pressure-testing equipment. The results were eye-opening. German was able to get 3311 fps using 107gr Sierra MKs in the 6XC. That’s roughly 200 fps faster than other popular extruded powders can deliver. With the 115 Berger, the 6XC topped 3200 fps, again a very impressive speed gain. Most 6XC shooters find that 3000-3050 fps is the most they can get with a 115gr bullet.
Speed by Design
What’s the secret to this new powder? First it’s made differently than most other propellants. Most extruded powders have an external coating on the kernels that governs burn rate. With RL17, the burn regulating compound saturates the entire kernel — it’s not just on the outside. The practical effect is that RL17 is able to maintain a higher energy level for a longer time — the energy output does not fall off as steeply as other powders. The other factor is density. Reloder 17 has fairly small kernels so it packs very tightly compared to H4831sc. As a result you can fit more powder (by weight) into the case.
Accuracy Testing Comes Next
German will continue his testing with other calibers — as soon as we can get more RL17 from Alliant. German also plans to start accuracy testing next week. If RL17 can deliver accuracy to match its high velocities, it looks like it would be a very good choice for the 6-6.5×47 Lapua, 6XC, 243 Win, 6mm Remington, .284 Winchester, and 30-caliber cartridges with the big (185+ grain) bullets.
Limited reloading data is available currently, but Alliant has distributed a preliminary load data sheet with loads for a dozen popular calibers. CLICK HERE to DOWNLOAD RELODER 17 DATA.
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Berger Twist-Rate Stability Calculator
If you have a .223 Rem, 6BR, .243 Win, 6.5×47 Lapua, 6.5×55, .308 Win, 30-06, or 300 WM Rifle, we recommend you buy a box of 
Instructions for Program
Well wait no more — Superformance and LeveRevolution powders are both IN STOCK at 
If you want to win shooting matches you’ll need to gauge wind speed and direction. While many shooters use the excellent Kestrel line of pocket Weather Trackers, many top shooters are turning to the Windtronic 2, a German-made unit that measures wind speeds from any direction.
