by Sierra Bullets Ballistic Technician Paul Box
One thing that plays a major role in building an accuracy load is neck tension. I think a lot of reloaders pretty much take this for granted and don’t give that enough thought.
So, how much neck tension is enough?
Thru the years and shooting both a wide variety of calibers and burn rates of powder, I’ve had the best accuracy overall with .002″ of neck tension. Naturally you will run into a rifle now and then that will do its best with something different like .001″ or even .003″, but .002″ has worked very well for me. So how do we control the neck tension? Let’s take a look at that.
First of all, if you’re running a standard sizing die with an expander ball, just pull your decapping rod assembly out of your die and measure the expander ball. What I prefer is to have an expander ball that is .003″ smaller than bullet diameter. So for example in a .224 caliber, run an expander ball of .221″. This allows for .001″ spring back in in your brass after sizing, and still gives you .002″ in neck tension. If you want to take the expander ball down in diameter, just chuck up your decapping rod assembly in a drill and turn it down with some emery cloth. When you have the diameter you need, polish it with three ought or four ought steel wool. This will give it a mirror finish and less drag coming through your case neck after sizing.
Tips for Dies With Interchangeable Neck Bushings
If you’re using a bushing die, I measure across the neck of eight or ten loaded rounds, then take an average on these and go .003″ under that measurement. There are other methods to determine bushing size, but this system has worked well for me.
Proper Annealing Can Deliver More Uniform Neck Tension
Another thing I want to mention is annealing. When brass is the correct softness, it will take a “set” coming out of the sizing die far better than brass that has become to hard. When brass has been work hardened to a point, it will be more springy when it comes out of a sizing die and neck tension will vary. Have you ever noticed how some bullets seated harder than others? That is why.
Paying closer attention to neck tension will give you both better accuracy and more consistent groups.
This helpful video from our friend Kirsten Joy Weiss explains how to avoid “scope bite”. This can occur when the scope, on recoil, moves back to contact your forehead, brow, or eye socket area. That’s not fun. While common sense tells us to avoid “scope bite” — sooner or later this happens to most shooters. One viewer noted: “I have come close. I had a Win Model 70 in .375 H & H Mag and I was shooting over a large rock in a strange position. The scope hit my eye glasses hard enough to bend the wire frames and cause a little pain on the bridge of the nose from the nose piece. [That] made a believer out of me.”
Kirsten offers a good basic principle — she suggests that you mount your rifle-scope so that the ocular (eyepiece) of the scope is positioned at least three inches or more from your eyeball when you hold the rifle in your normal shooting position. From a technical standpoint, optical eye relief is a property of the scope, so you want to purchase an optic that offers sufficient optical eye relief (meaning that it allows you to see the full circle of light with your head at least three inches from the eyepiece). Then you need to position the optic optimally for your head/eye position when shooting the rifle — with at least three inches of eyeball-to-scope separation (i.e. physical eye relief).
NOTE: You should mount the scope to provide adequate eyeball-to-scope separation for the actual position(s) you will be shooting most of the time. For an F-TR rig, this will be prone. For a hunting rifle, your most common position could be sitting or standing. Your head position will vary based on the position. You can’t assume the scope placement is correct just because it seems OK when you are testing or zeroing the gun from the bench. When shooting from a prone or kneeling position you may find your eye considerably closer to the eyepiece.
High-contrast targets make aiming (and seeing your bullet impacts) easier. EZ2C Targets, a family business in Pennsylvania, has developed a series of very bright, high-contrast targets printed with eye-popping fluorescent red/orange and Deep Black Inks. These are available from the EZ2C online store. A set of 11″x17″ Hi-Viz targets printed on quality white paper costs $8.50 for either 25 or 40 sheets, depending on design. A wide variety of designs are available — Bulleyes, Grids, Silhouettes, and Diamonds as well as many specialty targets. There are also 20 types of 3.5″ x 3.5″ Mini stick-on targets. These are printed with deep Black Ink on Fluorescent Red Self-Adhesive Label Stock.
EZ2C Fun Challenge Targets
EZ2C’s Battleship Target (Style 22) would be great for precision rifles at 100 or 200 yards. The red circles are about 3/4″ in diameter. That’s 0.36 MOA at 200 yards. That’s a good test for an accurate rifle (and for any shooting pals who boast that their guns can shoot “1/4 MOA all day long”.) The Dartboard target is great for a two-man shooting competition. You can shoot the numbers in order, or for more challenge, shoot the red rings (for each number), from the outer diameter to the middle. Just as in a real darts game, there are many variations.
Here are some other EZ2C Targets. The pistol diagnosis target (second from left) shows how to correct your aim and hold, based on where your errant shots fall. The decreasing dots target is a fun challenge for rimfire cross-training. Set it at 200 yards for centerfire.
Get Customized Targets for Your Club or Business
EZ2C targets can be customized with the name/logo of your gun club or business. This is an excellent way to promote your organization or store. Here’s a suggestion — have your gun club print up customized targets to award as prizes at shooting matches.
Most shooters realize that significant changes in temperature will alter how powders perform. That’s why you want to keep your loaded ammo out of the hot sun, and keep rounds out of a hot chamber until you’re ready to fire. But there are other factors to be considered — HUMIDITY for one. This article explains why and how humidity can affect powder burn rates and performance.
We’ve all heard the old adage: “Keep your powder dry”. Well, tests by Norma have demonstrated that even normal environmental differences in humidity can affect the way powders burn, at least over the long term. In the Norma Reloading Manual, Sven-Eric Johansson, head of ballistics at Nexplo/Bofors, presents a very important discussion of water vapor absorption by powder. Johansson demonstrates that the same powder will burn at different rates depending on water content.
Powders Leave the Factory with 0.5 to 1.0% Water Content
Johansson explains that, as manufactured, most powders contain 0.5 to 1% of water by weight. (The relative humidity is “equilibrated” at 40-50% during the manufacturing process to maintain this 0.5-1% moisture content). Importantly, Johansson notes that powder exposed to moist air for a long time will absorb water, causing it to burn at a slower rate. On the other hand, long-term storage in a very dry environment reduces powder moisture content, so the powder burns at a faster rate. In addition, Johansson found that single-base powders are MORE sensitive to relative humidity than are double-base powders (which contain nitroglycerine).
Tests Show Burn Rates Vary with Water Content
In his review of the Norma Manual, Fred Barker notes: “Johansson gives twelve (eye-opening) plots of the velocities and pressures obtained on firing several popular cartridges with dehydrated, normal and hydrated Norma powders (from #200 to MRP). He also gives results on loaded .30-06 and .38 Special cartridges stored for 663 to 683 days in relative humidities of 20% and 86%. So Johansson’s advice is to keep powders tightly capped in their factory containers, and to minimize their exposure to dry or humid air.”
Confirming Johansson’s findings that storage conditions can alter burn rates, Barker observes: “I have about 10 pounds of WWII 4831 powder that has been stored in dry (about 20% RH) Colorado air for more than 60 years. It now burns about like IMR 3031.”
What does this teach us? First, all powders start out with a small, but chemically important, amount of water content. Second, a powder’s water content can change over time, depending on where and how the powder is stored. Third, the water content of your powder DOES make a difference in how it burns, particularly for single-base powders. For example, over a period of time, a powder used (and then recapped) in the hot, dry Southwest will probably behave differently than the same powder used in the humid Southeast.
Reloaders are advised to keep these things in mind. If you want to maintain your powders’ “as manufactured” burn rate, it is wise to head Johannson’s recommendation to keep your powders tightly capped when you’re not actually dispensing charges and avoid exposing your powder to very dry or very humid conditions. The Norma Reloading Manual is available from Amazon.com.
Real-World Example — “Dry” H4831sc Runs Hotter
Robert Whitley agrees that the burn rate of the powder varies with the humidity it absorbs. Robert writes: “I had an 8-lb. jug of H4831SC I kept in my detached garage (it can be humid there). 43.5-44.0 gr of this was superbly accurate with the 115 Bergers out of my 6mm Super X. I got tired of bringing it in and out of the garage to my house for reloading so I brought and kept the jug in my reloading room (a dehumidified room in my house) and after a few weeks I loaded up 43.5 gr, went to a match and it shot awful. I could not figure out what was going on until I put that load back over the chronograph and figured out it was going a good bit faster than before and the load was out of the “sweet spot” (42.5 – 43.0 gr was the max I could load and keep it accurate when it was stored in less humid air). I put the jug back in the garage for a few weeks and I now am back to loading 43.5 – 44.0 gr and it shoots great again. I have seen this with other powders too.”
If you have two jugs of the same powder, one kept in a room in your house and one somewhere else where it is drier or more humid, don’t expect the two jugs of the same lot of powder to chrono the same with the same charge weights unless and until they are both stored long enough in the same place to equalize again.
Magpul has released a new modular chassis that should generate interest in tactical and PRS circles. Priced at $999.95, the Magpul Pro 700 Chassis is expensive — you can buy a complete Ruger Precision Rifle for less than that. But it looks like it has some impressive features that may justify the cost. The buttstock section features fast, ambidextrous controls for LOP and cheek-piece height. The Pro 700 features a strong, internal aluminum sub-chassis, with an universal bedding block section that works with both right-hand and left-hand actions.
Video Shows Key Features of Magpul Pro 700 Tactical Rifle Chassis:
Q: So what do you guys think — Is this thing worth a grand ($1000)?
Magpul Pro 700 Chassis Features
— Anodized machined 6061-T6 billet aluminum V-bedding block, body, adjustment knobs and fore-end with high-strength, injection molded polymer body covers.
— Ambidextrous bedding block for left-hand or right-hand actions.
— Folding stock with push-button hinge has left- or right-folding capability.
— Stock won’t interfere with bolt handle when folded.
— Fixed Stock adapter for non-folding use.
— Overall LOP adjustment range is 13.25” – 15.125”
— Butt pad adjusts up 1.33″ and down .90″ and 5° left or right.
— Comb height adjustment has a 1” range with locking knob for cheek piece.
— Cheek riser features a 3-position fore/aft adjustment.
— Polymer grip with 5° forward edge sweep, with 3/4” fore/aft trigger-reach adjustment.
— M-LOK® slots on fore-end for accessory mounting.
— Integrated AICS-pattern mag well for AICS-pattern short action magazines.
— Large trigger guard allows use with gloves and aftermarket triggers.
— Low-profile, anti-snag ambidextrous magazine release.
Product find by EdLongrange. We welcome reader submissions.
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, $26.99
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 $26.99 with FREE Shipping (on orders over $25.00).
2. EasyAcc 20000 mAh Battery Pack with Fast Charging, $35.99
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 $35.99 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, $143.88
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.
Nikon has a new line of First Focal Plane (FFP) riflescopes designed for tactical and PRS shooters. The very affordable BLACK FX1000 series includes 4-16×50mm and 6-24×50mm variants, with the choice of FX-MOA or FX-MRAD reticles. The FX1000 line features 30mm main body tube, high speed 10 MIL or 25 MOA turrets (with nice, tactile clicks), integral zero stop, and Nikon No Fault Lifetime Repair/Replacement on the entire riflescope. Most important thing — all FX1000 scope are under $800.
Burris, Bushnell, and Vortex should be concerned. We expect that Nikon will be stealing market share with the new, sub-$800 FX1000 line-up. This is solid choice for PRS production class, which is limited to $3000.00 total for rifle AND optic.
This Video Shows the Key Features of Nikon FX1000 Series FFP Scopes
Nikon offers 4-16×50mm and 6-24×50mm FX1000 models. The 4-16×50mm scopes provide 90 MOA/25 MRAD elevation adjustment range while the 6-24×50mm optics provide 60 MOA/17 MRAD elevation.
The BLACK FX1000 riflescopes are built on 30mm tubes from aircraft grade aluminum alloy with Type-III hard anodizing for ruggedness and durability. Waterproof, fog-proof and shock-proof, all BLACK FX1000 models are backed by Nikon’s lifetime, No Fault repair/replacement policy.
Here the 6.5 Guys interview Jeremy Bentham, a PRS Competitor who helped design the New FX1000 series scopes:
Nikon’s new FX1000 optics feature “high-speed” turrets (10 Mil or 25 MOA) with nice, tactile clicks. PRS shooter Jeremy Bentham designed the new reticles which are clear and easy-to-use. The 4-16x50mm model is $649.95 while the 6-24x50mm is $799.95 MSRP. These represent outstanding value for a big name, life-time warranty product.
A few good men (and women) — that’s what the shooting sports need these days. We need skilled, trained personnel to serve as Range Safety Officers (RS0s). Without RSOs, there would be no shooting matches — no F-Class, no High Power, no Smallbore Matches — you get the idea. Thankfully there are now ways to get requisite RSO training without costly travel far from home.
The NRA now offers an online training course for its Range Safety Officer (RSO) program. The online course teaches the skills needs to conduct and supervise safe shooting activities and range operations. Online RSO Course students can access the electronic course materials for 90 days. You can complete the course in multiple sessions. The program will save your progress so you can return later.
• Introduction to the NRA Basic Range Safety Officer Course
• The Role of the NRA Range Safety Officer and Range Standard Operating Procedures
• Range Inspection and Range Rules
• Range Safety Briefing
• Emergency Procedures
• Firearm Stoppages and Malfunctions
Who Can Take the Course?: The Online RSO Course is available to anyone who currently possess a valid NRA Firearms Instructor certification or NRA Coach appointment. Course cost is $125.00. Individuals without a trainer rating must attend the in-person Range Safety Officer course consisting of both classroom time and practical exercises on a range.
Certification Procedure: Students must complete all six lessons and a short electronically administered test in order to become a certified Range Safety Officer. Once the test has been passed, newly certified Range Safety Officers will receive an electronic completion certificate that can be printed or saved to a computer.
The NRA RSO program was developed in response to the demand for a nationally-recognized range safety officer certification. More than 54,000 NRA Range Safety Officers are involved in aspects of target shooting, training, and range supervision around the USA.
Range Safety Officer supervises the line at Berger SW Nationals. Without dedicated RSOs, we could not have matches like these.
Non-member price is $1499.99. The “Members price” is $1349.00. Using CODE SK1602 at checkout knocks the final price to $1249.99 (plus tax and shipping).
Here’s a super deal if you need a high-quality, high-magnification zoom scope for F-Class and long-range target shooting. Right now, the Vortex Optics Golden Eagle 15-60x52mm ECR-1 is on sale at Sportsman’s Guide for $1249.99 (member price) with Coupon Code SK1602. That Code gives you a “double discount”. However, it will cost you $39.99/year to join the Buyer’s Club to get member pricing. You can cancel Buyer’s Club membership anytime.
IMPORTANT: The $1249.99 Price is for BUYER’s CLUB only. And you MUST use CODE SK1602!
Still a deal if you’re not yet a member? You bet. This same scope sells elsewhere for around $1500.00. For example the price today, 3/21/2017, at Amazon.com is $1499.00 (see below). If you figure you’ll pay at least $1490.00 elsewhere for this scope and you net out the $39.99 membership cost, we calculate you’ll still save $200.00+ by taking advantage of this deal.
Here is the price on Amazon.com on March 21, 2018:
The Golden Eagle has earned good reviews from our Forum members. This scope features 60X max magnification, sharp lenses, low-dispersion glass, 1/8-MOA clicks, and a reticle that features MOA-based hold-offs and hold-overs subtensions are MOA-based at 40X magnification:
This custom war wagon hauls varmint hunters around the Longmeadow Game Resort in Colorado.
The woes of winter are behind us — it’s officially Spring. Today, March 20, 2018, is the Vernal Equinox, the official start of Spring. For many shooters, the coming of Spring means that it’s time to head out to the varmint fields. Here are six items that can help ensure successful spring varmint adventures.
Six Great Products for Varmint Shooters
1. BarrelCool In-Action Fan
Busy Varmint shooters may expend hundreds of rounds in a day. That’s tough on barrels. One way to extend your round count is to use the ingenious BarrelCool device. This little yellow gadget fits in your action with a blower tube that goes into the chamber. A small electric fan blows cooling air through the barrel. It really works — folks who’ve purchased the Barrel Cool and run temp strips on their barrel say the BarrelCool can significantly reduce the time it takes to cool down a hot barrel.
In the past, folks have tried various methods to cool barrels: water flushed through the bore, CO2 tanks, even battery-operated fish pumps. BarrelCool is a simpler, less costly, and much handier solution. Priced at $34.99, this small device can potentially can save you money by extending barrel life. To see how Barrelcool works, visit BarrelCool.com. There you’ll find video demos of BarrelCool units in both bolt-action and AR-type rifles.
2. Uncle Bud’s Bulls Bag Sandbag
On most varmint hunts we spend most of the time shooting from a portable bench with a pedestal-type rest (we like the SEB Mini). But it’s nice having a big, heavy X-Type sandbag rig also. These four-chamber designs, such as the Uncle Bud’s Bulls Bag, allow shooting from a truck hood or any flat surface. Some rifles with narrow fore-ends really benefit from the firm “hug” provided by these “butterfly” style sandbags. We like the 15″ Uncle Bud’s Bulls Bag, currently $51.30 at Amazon (camo fabric). Durable and well-made, it will provide years of service. There is also a 10″ version that is easier to carry. Forum member Stoner24mkiv likes a Bulls Bag for shooting from a vehicle. He also suggests: “[take] an adjustable bipod if you are going to do any walking. Have a fanny pack or backpack for extra ammo, water, bore-snake, etc. when you go on your walkabouts. Bring a Boonie hat for blocking the sun, sun glasses, sunscreen. High leather boots.”
3. Scope with Built-In Laser Rangefinder
The Burris Eliminator III is an impressive piece of electro-optical technology. With a push of a button, a built-in laser rangefinder senses the distance to your target and the Eliminator’s microprocessor instantly calculates the required hold-over based on your load’s ballistics. The calculated aiming point is then displayed in the reticle with an illuminated red dot on the vertical cross-hair. Just put the red dot on the target and make the shot. Easy as that. If you are working a large prairie dog field and constantly moving near to far and back again, this scope is really handy. Laze, adjust aim with the dot, and squeeze the trigger. Its that simple. We’ve used this scope out to 500 yards on small steel targets and it worked flawlessly.
4. Hornady 17 HMR V-Max Loaded Ammo
For those distant prairie dog shots, you’ll want a centerfire round with some reach, such as a 22 BR or 22-250. However, for closer work, or for smaller varmints such as ground squirrels, the 17 HMR is hard to beat. There are many good factory rifles chambered for the 17 HMR, such as the Savage A17 (shown below). Right now Hornady 17 HMR ammo is on sale at Grafs.com for $8.99 ($0.18 per round). That’s a good deal. This same ammo sells elsewhere for up to $13.99 per 50-round box. For example, MidwayUSA’s price is $12.99.
5. Stick-On Temp Strips Monitor Barrel Heat
You never want your barrel to get too hot. Accuracy suffers when barrels over-heat, and excessive heat is not good for barrel life. So how do you monitor your barrel’s temperature? You can check if the barrel is “warm to the touch” — but that method is not particularly precise. There is a better way — using temperature-sensitive strips. McMaster.com (an industrial supply house) offers stick-on temp strips with values from 86° F to 140° F. A pack of ten (10) of these strips (item 59535K13) costs $12.16 — so figure it’ll cost you about $1.20 per barrel for strips. That’s cheap insurance for your precious barrels. For best barrel life, try to stay under 120 degrees F.
6. Low-Fouling Power for High-Volume Varmint Loads
For high-shot-count varmint safaris, you want a clean-burning powder that minimizes barrel fouling. While there are many great powders for the .223 Rem, we like Hodgdon CFE 223 for our high-volume varmint loads. This powder really seems to keep barrels cleaner. Originally developed for U.S. rapid-fire military systems, CFE 223 incorporates a proprietary chemistry named “Copper Fouling Eraser”. Based on tests with extended shot strings, Hodgdon claims that, by using CFE™223, match shooters, varmint hunters, and AR shooters can maintain accuracy for longer periods, with less barrel-cleaning time. You may want to check it out.
Tests Show Burn Rates Vary with Water Content
The 
Certification Procedure: Students must complete all six lessons and a short electronically administered test in order to become a certified Range Safety Officer. Once the test has been passed, newly certified Range Safety Officers will receive an electronic completion certificate that can be printed or saved to a computer.
