If you’ve been thinking about a big purchase at Brownells, here are some money-saving codes. Brownells is currently offering 10% Off a $150+ purchase, 15% Off Bullet buys, 15% Off Select Optics, 15% Off AR15 parts, and $10 Off a $100 purchase. It’s simple to get these discounts — there are no buyers’ clubs to join, no forms to fill out. Just use the appropriate Discount Code during online check-out.
Listed below are the Codes to use. Simply use the appropriate Code for your purchase at Brownells.com. NOTE: Most of these codes have no listed expiration date, so Brownells could terminate them at any time. And the first three codes expire on April 30, 2024. Accordingly, we recommend you do your shopping soon. Also if the highest value code no longer works, try a lesser value CODE.
Coupon Code: April120 — $120 Off $1000
Expiration date: 4/30/2024
Coupon Code: April50 — $50 Off $500
Expiration date: 4/30/2024
Coupon Code: April20 — $20 Off $200
Expiration date: 4/30/2024
Coupon Code: AR15 — 15% off AR Parts
Expiration date: Unknown
Coupon Code: BULLET15 — 15% off Bullets
Expiration date: Unknown
Coupon Code: TA10 — 10% off $150+
Expiration date: Unknown
Coupon Code: TTB10 — 10% off $150+
Expiration date: Unknown
Coupon Code: WLS10 — 10% off $150+
Expiration date: Unknown
Coupon Code: TRIGGERED — 10% off $150+
Expiration date: Unknown
Coupon Code: GIFT10 — $10 OFF $100
Expiration date: Unknown
Coupon Code: SMSAVE — $10 OFF $100
Expiration date: Unknown
NOTE: None of the above codes include FREE or Discounted Shipping. But check when you purchase to see if free (or discounted) shipping is offered for your particular item(s). Depending on the weight/size of the item, this might be a better deal than saving $10-$20.
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The 2024 NRA Annual Meetings & Exhibits will take place at the Kay Bailey Hutchison Convention Center on May 17-19, 2024 in Dallas, Texas. That’s just three weeks away. The Exhibit Hall is open all three days and will showcase over 14 acres of the latest guns and gear from the most popular companies in the Industry. From entertainment to special events, it’s all happening in Dallas. GET More info here: https://NRAAM.org.
Scheduled Events at 2024 NRA Annual Meetings and Exhibits
May 16 — NRA Foundation Banquet and Auction
May 16-18 — NRA Voter Verification
May 16-19 — NRA Wall of Guns (with Giveaways)
May 17 — NRA Foundation Nat’l Firearms Law Seminar
May 17 — NRA Clubs and Associations Workshop
May 17 — Co-Ed Women’s Leadership Forum Gala
May 18 — NRA Annual Meeting of Members
May 18 — Hunters’ Leadership Forum Reception
May 19 — National Prayer Breakfast
DATE TBD — NRA Leadership Forum
NRA Convention Exhibitor Floor Plan (Find Company Locations)
Hundreds of leading firearms, ammo, optics, and accessories makers will showcase their products at the NRA convention. CLICK HERE to visit the Floor Plan map page. There you can find booth number for your favorite exhibitors.
MAP for Hutchison Convention Center Area in Dallas
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In 2024, the CMP Pistol Matches at Camp Perry will include Air Pistol Nat’l Championships, Small Arms Firing School, M9 EIC Match, Rimfire Pistol Matches, Centerfire Pistol Matches, Revolver EIC Match, .45 Pistol Matches, National Trophy Matches, GSSF Glock Nat’l Challenge, Military/Police Pistol Match, and 1911 As-Issued Match.
Since the turn of the 20th century*, Camp Perry has hosted major marksmanship events. While the rifle competitions get the most coverage, the National Matches also include bullseye pistol competition. Bullseye pistol shooting can bring nearly a thousand competitors to Camp Perry each summer, as part of the CMP National Championships. For these Camp Perry pistol matches, targets are set at 25 and 50 yards. The shooting position is standing, with most events firing one-handed in slow fire, timed fire, and rapid-fire.
Since their inception over a century ago, the National Matches have become a major shooting sports festival with over 4,500 annual participants. Held at the Camp Perry Nat’l Guard Training Base, the National Matches now include both indoor and outdoor events. Adult and junior athletes are welcome.
Camp Perry Bullseye Pistol Competition
Camp Perry is synonymous with the oldest and most prestigious annual trophy matches in our nation’s history. And in a venue renowned for service rifle matches, the sport of precision pistol is no less important, no less challenging, and no less respected. The National Trophy Pistol Matches is all about traditional handgunning — the stance, the intense concentration, and of course, the one-handed grip. It’s all unmistakable as the game of Bullseye Pistol. Every year there are no fewer than 24 separate match trophies for the top Bullseye Pistol shooters, both military and civilian. And the very best will claim National Match Trophies and receive the President’s 100 Tab.
This video shows .45 ACP centerfire pistol competitors at Camp Perry
Civilians and military shooters competed together at the 2019 NTT Pistol Match.
* The first National Matches at Camp Perry were held in 1907. SEE: A Short History of Perry and the National Championships by Hap Rocketto.
This content is Copyright 2024 AccurateShooter.com. No reproduction on any other website is authorized. Use of this content without payment of licensing fees is a violation of Federal law.
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Vihtavuori Powders, a leading choice of competitive target shooters and long-range hunters, returns as the title sponsor of the F-Class Points Series V2 Finale. The 2024 V2 Finale will be held May 23-26, 2024 and at the Bayou Rifles Juliff Range in Rosharan, Texas.
“We’re thrilled to extend our partnership with Vihtavuori for the 2024 V2 Finale event! As one of our original sponsors, their direct support has been instrumental in bringing this event to life and supporting its growth, commented Tod Hendricks, F-Class Point Series member. “Now serving as the lead sponsor, Vihtavuori’ s continued generosity ensures that events like ours can flourish, offering fresh and exhilarating experiences in the competitive shooting sports arena.”
The F-Class Points Series is a yearlong F-Class points system and leaderboard, that culminates in the V2 Finale, which pits F-Class competitors against each other in a bracket-style double elimination match. Sixty-four competitors, 32 for each class (F-Open and FT/R), are invited to the Finale based on their series ranking. Since the V2’s inaugural series in 2021, partnerships have begun in Canada, South Africa, Italy, and Australia. The 2024 Finale will be held May 23-26 at Bayou Rifles in Rosharon, TX.
CLICK HERE for V2 Finale and F-Class Points Series rules. For more information on the F-Class Points Series and V2 Finale, visit FClassPointSeries.com.
This new-format match pits F-Class competitors against each other in a bracket-style double elimination match. The elite field (32 per class) is selected via a preceding Points series. In the past targets were placed at 1000 yards. In something unusual for an American F-Class match, in the V2 Finale all shooting will be done via PAIR FIRING, with shooters going head-to-head with alternating shots. The listed course of fire for 2024 is:
3.1. 2 CONVERTIBLE SIGHTERS AND 15 SHOTS FOR RECORD AT 1000 YARDS, PAIR FIRE
3.2. 2 CONVERTIBLE SIGHTERS AND 10 SHOTS FOR RECORD AT 1000 YARDS, PAIR FIRE
3.3. 5 SHOTS FOR RECORD AT 1000 YARDS, PAIR FIRE
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Every Tuesday an interesting technical feature is posted on the Applied Ballistics Facebook Page. For today’s 4/23/24 “Tech Tuesday”, a fascinating video of a bullet in flight was posted. This Schlieren video illustrates a 6mm 109gr Berger LRHT bullet traveling at 3163 FPS. The stunning video reveals the bullet shockwave and the turbulent wake. Check it out:
About the Schlieren Imaging Process — What It Shows
Schlieren Imaging is a way of making airflow features visible. You can clearly see the compression (shock) wave at the front of the bullet. A compression wave is formed when the air has to move faster than the speed of sound to get out of the way, which is certainly the case for this bullet which is moving about 2.5 times the speed of sound (Mach 2.5). That shock wave is the ‘snap’ you hear when bullets fly past you if/when you’re downrange. Also, compressing the air into a shockwave takes energy, and that energy comes directly out of the forward velocity of your bullet and gets converted into heat and noise as the shock wave forms and dissipates. The turbulent wake at the base of the bullet shows where/how base drag applies. The third and smallest component of drag for a supersonic bullet is skin friction drag, which is a viscous boundary layer effect, and is the least visible in this image.
Above is a second Schlieren imaging video. This shows a 6mm 109gr Berger LRHT bullet at ~2800 fps as fired from a PRS rifle at the Applied Ballistics Lab. Bryan Litz notes: “You can clearly see the compression (shock) wave at the front of the bullet. A compression wave is formed when the air has to move faster than the speed of sound to get out of the way, which is certainly the case for this bullet which is moving about 2.5 times the speed of sound (Mach 2.5).”
Science of Accuracy Exclusive Content for Subscribers
Applied Ballistics has a huge archive of shooting-related ballistics and technical information plus exclusive videos. You can access all this information plus great members-only podcasts by subscribing to the Science of Accuracy Academy for $9.95/month.
Do you often carry a concealed handgun? Then you can benefit from Beretta’s FREE 15-page e-book, Ten Essential Tips for CCW Holders. This eBook, in handy PDF format, helps gun owners select an appropriate handgun (and holster), understand legal obligations and responsibilities, and train effectively with the firearm. This short PDF eBook offers many useful tips to consider, in particular for gun owners who are contemplating the pros and cons of everyday carry for themselves.
As the Beretta CCW booklet says, “Carrying a concealed handgun requires a certain amount of confidence. You need to be confident in your knowledge of laws and regulations. You have to have confidence in your accuracy, and you need to trust that you can carry a gun effectively, securely and comfortably. If a gun is a burden for you to carry, you probably won’t.”
Surprising Facts About Actual Defensive Handgun Use
You may be surprised to learn when and how handguns are actually used for self-defense. Most defensive uses are at very short range and the incident only lasts a matter of seconds. You need to be prepared, and train to be proficient drawing and aiming your weapon. And remember, shooting is a last resort, when a safe retreat is not available.
55% of gunfights take place in 0-5 feet.
20% of gunfights take place in 5-10 feet.
20% of gunfights take place in 10-21 feet.
95% of gunfights take place in 0-21 feet. (Source: FBI)
The average man can cover 21 feet of ground in 1.5 seconds.
The average gunfight is over in 3-5 seconds.
3 to 4 shots are usually fired.
Most gunfights take place in low-light conditions.
On average, one shot in four strikes someone.
Here are two (2) sample pages from Beretta’s CCW eBook.
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Target Sports USA is running a big ammo sale on 4/25/24 with 12% savings. This AMMO+ sale offers AMMO+ members a major 12% discount on select ammunition. Scheduled for April 25th, this one-day event offers an additional discount to all AMMO+ Members. Plus, along with the big sale, AMMO+ members can enter to win a $30,000 Colorado Guided hunt.
To benefit from the sale you need an AMMO+ Membership with Target Sports USA. This Membership costs $99.99. Based on members’ product discounts, the average annual membership savings is $390.00. Benefits include 8% discount on ammunition, plus FREE Shipping on most orders. SEE DETAILS HERE.
Get an AMMO+ Membership and Participate in AMMO+ Day 2
There is still time to get an AMMO+ membership and benefit from the AMMO+ Day 2 12% Off Sale. The annual Membership offers year-round benefits, including ammunition discounts, FREE Shipping, and members-only event participation.
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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.
NOTE: All listed products are for sale to persons 18 years of age or older. No products are intended for use by minors.
1. Midsouth — Blem Bullets Sale, 65+ Types Up to 50% Off
⏺ Big savings on rifle bullets .22 to .416 cal, match and hunting
Here’s a great Blem Bullet Sale at Midsouth. Save up to 50% on a wide range of bullets, from .22 Cal varmint projectiles up to massive 400+ grain hunting bullets. Chose among BTHP, Polymer Tip, Aluminum Tip, and even a few unleaded types. You’ll probably find something you’ll like, with huge savings. For example, PRS competitors can get 250 6mm 90gr bullets for just $59.99 — a mere 24 cents each (37% discount). And varminters can get 55gr BTHP bullets for just 13 cents each (price $32.99 for 250).
2. Midsouth — Lyman Gen 6 Powder Dispenser, $219.99
⏺ Save $40 (15%) on popular powder scale/dispenser
Optimal accuracy and low ES/SD demands very precise (and consistent) powder charges. You’ll want a quality powder scale/dispenser such as the Gen 6 Compact Digital Powder Dispenser System. Accurate to 0.10 grain, the Lyman Gen6 dispenses various types of smokeless powder at two grains per second. This machine has an auto repeat function that drops a precise charge each time the pan is reset.
3. Natchez — Primers and Ammunition Sale
⏺ Save on CCI, Fed, & Rem primers plus rimfire and centerfire ammo
The shortage of primers is easing, with prices dropping a bit. If you need primers, check out the current Primer and Ammo Sale at Natchez. A wide range of CCI, Federal, and Remington primers are on sale, with savings of $20-$35 per 1000. In addition there are significant discounts on rimfire and centerfire ammunition. Note: This sale concludes on Tuesday 4/23/24, so don’t delay.
⏺ Effective, compact hearing protection with ability to hear range commands
Protect your hearing and monitor range commands with the Radians Vertex Nano Electronic Earplugs now just $74.95 at Creedmoor Sports. The custom micro-circuitry has 2 mode levels for standard and enhanced amplification with < 0.02 second reaction time to protect against dangerous impulse noises. Dedicated right and left plugs are each powered by ultra-efficient batteries with 120 hours life. This is a great deal! These very same Radian electronic earplugs cost $119.99 elsewhere.
5. MidwayUSA — Vortex Gen I Diamondback Binoculars, $129.99
⏺ Great 10×42 binocs for the money — good choice for varminters
At the range or in the field, a good pair of binoculars is very useful. Right now the 10x42mm Vortex Optics Gen I Diamondback Binoculars are $100 off at MidwayUSA — a 43% savings. These lightweight (24 oz.) binoculars offer a wide field of view and a lifetime VIP Vortex warranty. These rubber-armored binocs are a good choice for hunters and backpackers. The Diamondback series are O-ring sealed and argon-purged for true 100% weatherproofing.
6. Graf’s — Competition Electronics Chron and Timer Sale
⏺ Big savings on chronos and timers
Every serious shooter needs a good chronograph. If you’re in the market for a chrono or timer check out the Competition Electronics sale at Graf & Sons. You can get a reliable Comp. Electronics chronograph for just $120 — hundreds less than a LabRadar or Garmin. And if you compete in timed, speed-based matches, a Comp. Electronics timer will help you train more effectively.
7. Amazon — Case Prep Multitool, $14.99
⏺ Great price on versatile tool with internal storage
Proper brass prep includes chamfering and deburring case-mouths as well as cleaning the primer pockets. For a modest $14.99 price, the TYRWEEY Case Prep Multitool (#ad) can perform all these key tasks. This tool will chamfer, deburr. and clean pockets. A very nice feature is that the tool heads can be stored INSIDE the handle when not in use. The tool has a non-slip, checkered exterior for secure handling.
8. Amazon — Tactical 4-Pistol Range Bag, $39.99
⏺ Good price on well-made, roomy Pistol bag.
The DSLEAF Tactical Gun Range Bag (#ad) is a good, sturdy bag that holds up to 4 full-size handguns. This DSLEAF bag has 3 inner removable dividers, 2 mesh pockets, and 6 mag-holders. It can hold up to 4 pistols as well as earmuffs and shooting eyewear. There are nice zippered pockets on the side and good, thick internal padding. If you’re not a pistol guy, you can also use this bag to haul your chronograph, target cam, and other accessories.
9. Amazon — Target Stand Dual Pack, $49.97
⏺ Good price on pair of adjustable target stand
The Knine Outdoor Shooting Target Stand kit (#ad) allows you to set up your own elevated target in any shooting area. This kit includes 2 metal target stands, 8 ground stakes, 8 butterfly screws, plus paper clips. The base units adjust for width from 13″ to 24″ horizontal spread. This kit includes ten printed 16″x12″ shooting paper targets. NOTE, you must supply your own wood risers and cardboard target backers.
10. Amazon — 6-Pack Stackable AkroBins, $15.00
⏺ Good option for tool and reloading components stackable storage
Parts, brass, and bullets all need to be kept safe on the bench when you’re reloading. Akro-Mils AkroBins (#ad) are a quality option that can be placed on wall racks, shelving, or on a benchtop. These can be stacked securely. These AkroBins are sold in packs of six for $15.00, and are available in four colors: red, yellow, blue, and white. Dimensions are 4-1/8″ Wide x 5-3/8″ Deep x 3″ High.
As an Amazon affiliate, this site can earn revenues through sales commissions.
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Initial radar testing shows an interesting stability trend for slugs vs. pellets: drag is minimized for pellets in slower-twist barrels, while drag of slugs is minimized for a faster twist. Also, consistency of drag/BC is best when drag is minimized (BC maximized).
Show below are test data for .300 caliber 44.5 grain Slug and .300 caliber 44.8 grain Pellet, both shot from an air rifle around 800 FPS. Experienced air rifle shooters told us to expect this so it’s nice to see the measurements supporting this trend!
So why is fast twist good for slugs while bad for pellets and vice versa? Air rifle pellets with a skirt are mostly drag-stabilized, not spin-stabilized. So, they don’t need much if any spin at all to fly point forward; the skirt catches the air like the fins of a rocket. As such, spinning the pellets faster only becomes a problem of dynamic stability. If I had any suggestion after looking at this data, it would be to try an even slower twist for pellets, perhaps a 1:60″ (one turn in 5 feet) or even 1:120″.
Slugs are spin-stabilized so it reasons that more spin suppresses yaw and maximizes BC, to a point. Based on these results, it appears the slug is reaching max stability/BC with the 1:22″ and the 1:18″ provides no further benefit. Again, these are just initial findings, we’re eager to explore further in the coming weeks! To view our recent Air Rifle projectile testing, with full 8-minute video, CLICK HERE.
Top is a CZ 457 MTR; middle Anschutz with BR stock; bottom is Bergara B14R in DPT Chassis.
With the variety of rimfire disciplines, from cowboy action to Olympic three-position smallbore, there are countless different rimfire designs on the market — bolt guns, lever guns, single-shots, toggle-links and more. These may shoot the same ammo, but they certainly vary in looks and ergonomics. This is testimony to human creativity.
In our Shooters’ Forum, you’ll find a long-running thread showcasing rimfire rifles for plinking, hunting, 3P Target Shooting, Silhouette, Rimfire F-Class, NRL22 and more. Here are some of the notable recently-posted rifles in that Forum thread, with brief build/component details.
ARA Benchrest Rifle with Stiller Action, Shilen Ratchet Barrel
Forum member Peebles24 showcased his cool flame-paint-job .22 LR benchrest rifle against a scenic, snowy background (never too cold to shoot right?). “I had a new rifle built this past fall by Mark Penrod at Penrod Precision. Stiller 2500X action, Shilen ratchet barrel, Jewell trigger, McMillan stock, Harrell’s tuner, Sightron SIII 10-50×60mm glass. I’m shooting it off my Arnold Machine one-piece rest made locally by Cliff Arnold. I visited the Lapua Testing Center East and got a case of Midas+.” For ammo testing results, click photo at right.
In late April the gun competed in its first ARA benchrest match in Wabash, Indiana.
Beautiful MasterClass-Stocked Rifle for Rimfire F-Class
Here is a handsome rifle belonging to Forum member Redd. Set up for prone Rimfire F-Class-style competition, this rig features a Shilen Ratchet barrel with Erik Cortina Tuner fitted to a Stiller 2500X action. It boasts a beautiful MasterClass figured Walnut stock and rides on a SEB Joy-Pod bipod up front. The optic is a Nightforce 40x45mm Competition.
CZ 457 .22 Magnum Transformed with KRG Bravo Stock
Forum member JAS-AS purchased a .22 Magnum CZ which he revived as a training rig with a new stock. He posted: “I use a CZ457 in .22 Magnum mainly as a trainer — bipod and rear bag kind of stuff. It has evolved over the last year or so. Next change will be a Lilja barrel. This because it can shoot brilliantly (at times) but not consistently. And accuracy degrades as it gets minimally dirty. Also, it doesn’t like 40gr rounds — the groups open up to 1.5 MOA. It’s at its best with 30 and 35 grain rounds running at up to 2250 fps. I believe that to be a twist-rate issue.”
The “Before” photo shows the rifle “as purchased” with a Nikon Monarch 4-16x42mm mildot scope. The “After” image shows the CZ 457 as modified. JAS-AS notes: “I added a bunch of stuff: KRG Bravo stock, Vortex Strike Eagle 5-25x56mm FFP scope, new bipod and Precision Underground bag, trigger spring. With this setup I shoot at 100 yards+ exclusively.” Show at right is a 9-shot group with the rifle at 100 yards. Three-shot groups at 100 have been below half-MOA.
Savage Mark II Squirrel/Field Rifle
This Savage Mark II rifle isn’t fancy, but it has brought much satisfaction to its owner, Forum member “Ohio Varmint Shooter”. He posted: “Just a nice field gun. Less than $200 (without scope). Cheap wooden stock, thin pencil barrel. My squirrel/field gun. There is absolutely nothing special about this… except it’s lefthanded. It shoots fine, preferring CCI standard velocity rounds. I did splurge and put a more-than-needed scope on it. Most scopes with fixed parallax (in this category), have it fixed at 50 yards. I wanted variable parallax so I could set it at 35 yards. I don’t know if it really makes any difference, but I do try to go for accurate head shots. The scope is also a little overkill in magnification, but it does help with the head shots and my aging eyes.”
“As a youth in the 70s, I always dreamed of a left-handed bolt. So getting back into shooting/hunting about 8 years ago, I was delighted to discover this gun. Growing up I had a semi-auto 22, but being a lefty … it would spit powder on my face.” — Ohio Varmint Shooter
Tikka T1x Action in Eliseo Competition Machine Chassis
Here is Gary Eliseo’s personal Rimfire Match Target Rifle with Tikka T1x action. The T1x action is carried in Competition Machine Rimfire Chassis. Gary also posted some recent 100-yard groups, using SK rifle match ammo in this rifle. Gary runs Competition Machine LLC and produces the chassis system for this cool rig, along with outstanding Across-the-Course, High Power, and F-Class chassis systems for rimfire and centerfire rifles.
Vudoo Action Benchrest Rifle with Benchmark 3-Groove Barrel
Here is a classy benchrest rig belonging to Forum member FCJIM. It features a Vudoo LBRP action, Benchmark 3-groove barrel, Harrell’s Precision tuner, NightForce Benchrest scope, and McMillan Edge stock. The stock work was done by Doan Trevor, while FCJIM did the metal work himself, using a Nevius reamer. This rig likes to shoot ELEY Black and Lapua Midas+ ammo.
Last but not least, here is a “blast from the past”. This classic lever-action single shot is crafted by CPS Rifles (Paul Shuttleworth), a boutique gun-maker specializing in single-shot rifles, particularly reproductions of the Stevens 44 1/2. Note the richly-figured wood and the lovely color case-hardening on the receiver. There is a dual Set Trigger system. You pull one trigger through a relatively long stroke until it clicks. The the second trigger breaks the shot (and drops the hammer) with just a few ounces of pull weight. This rig, fitted with MPA Vernier-type tang sights, belongs to Forum member “Mills” from Texas.
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Photo 1: Three Near-Equal-Weight 7mm Bullets with Different Shapes
TECH TIP: Bullets of the same weight (and caliber) can generate very different pressure levels due to variances in Bearing Surface Length (BSL).
This article, from the USAMU Facebook Page, concerns reloading safety. In the relentless quest for more speed and flatter ballistics, some hand-loaders load way too hot, running charges that exceed safe pressure levels. Hint: If you need a mallet to open your bolt, chances are your load is too hot. Stay within safe margins — your equipment will last longer, and you won’t risk an injury caused by over-pressure. In this article, the USAMU explains that you need to account for bullet shape, diameter, and bearing surface when working up a load. Don’t assume that a load which is safe for one bullet will be safe for another even if both bullets are exactly the same weight.
How Bullet Profile and Bearing Surface Affect Pressure Levels
Today, we continue our handloading safety theme, focusing on not inadvertently exceeding the boundaries of known, safe data. Bullet manufacturers’ loading manuals often display three, four, or more similar-weight bullets grouped together with one set of load recipes. The manufacturer has tested these bullets and developed safe data for that group. However, seeing data in this format can tempt loaders — especially new ones — to think that ALL bullets of a given weight and caliber can interchangeably use the same load data. Actually, not so much.
However, bullet designs include many variables such as different bearing surface lengths, hardness, and even slight variations in diameter. In fact, diameters can occasionally range up to 0.001″ by design. Thus, choosing untested bullets of the same weight and caliber, and using them with data not developed for them can yield excess pressures.
This is only one of the countless reasons not to begin at or very near the highest pressure loads during load development. Always begin at the starting load and look for pressure signs as one increases powder charges.
Bullet Bearing Surface and Pressure
Bullet bearing surface length (BSL) is often overlooked when considering maximum safe powder charges and pressures. In Photo 1, note the differences in the bullets’ appearance. All three are 7 mm, and their maximum weight difference is just five grains. Yet, the traditional round nose, flat base design on the left appears to have much more BSL than the sleeker match bullets. All things being equal, based on appearance, the RN/FB bullet seems likely to reach maximum pressure with significantly less powder than the other two designs.
TECH TIP: Bullets of the same weight (and caliber) can generate very different pressure levels due to variances in Bearing Surface Length (BSL).
Bullet 1 (L-R), the RN/FB, has a very slight taper and only reaches its full diameter (0.284 inch) very near the cannelure. This taper is often seen on similar bullets; it helps reduce pressures with good accuracy. The calculated BSL of Bullet 1 was ~0.324″. The BSL of Bullet 2, in the center, was ~0.430″, and Bullet 3’s was ~ 0.463″. Obviously, bullets can be visually deceiving as to BSL!
Some might be tempted to use a bullet ogive comparator (or two) to measure bullets’ true BSL for comparison’s sake. Unfortunately, comparators don’t typically measure maximum bullet diameter and this approach can be deluding.
Note: Due to time constraints, the writer used an approximate, direct measurement approach to assess the bullets’ different BSLs. While fairly repeatable, the results were far from ballistics engineer-grade. Still, they are adequate for this example.
Photo 2: The Perils of Measuring Bearing Surface Length with Comparators
In Photo 2, two 7mm comparators have been installed on a dial caliper in an attempt to measure BSL. Using this approach, the BSLs differed sharply from the original [measurements]. The comparator-measured Bullet 1 BSL was 0.694” vs. 0.324” (original), Bullet 2 was 0.601” (comparator) vs. 0.430” (original), and Bullet 3 (shown in Photo 2) was 0.602” (comparator) vs. 0.463” (original). [Editor’s comment — Note the very large difference for Bullet 1, masking the fact that the true full diameter on this bullet starts very far back. You can use comparators on calipers, but be aware that this method may give you deceptive reading — we’ve seen variances just by reversing the comparators on the calipers, because the comparators, typically, are not perfectly round, nor are they machined to precision tolerances.]
Thanks to the U.S. Army Marksmanship Unit for allowing the reprint of this article.
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Product innovation is all about “building a better mousetrap”, or in this case, building a better bore-cleaning patch. A real smart guy, Shane Smith, has invented a triangular patch that earned a patent. The U.S. Patent Office has awarded a utility patent for BoreSmith’s triangular Pyramid Patch™. This unique cleaning patch was designed by Shane Smith, a mathematician/physicist who employed his scientific and firearms knowledge to create innovative bore-cleaning products.
BoreSmith’s clever Triangle Patch™ (aka Pyramid Patch) presents more cleaning surface area to the bore wall than does a conventional square or round patch (of equivalent size). At the same time, the unique geometry makes Triangle Patches much less likely to jam in the barrel. This is because the notches in the sides of the triangle allow the patch to sit more uniformly on the jag (without bunching up). In addition, the Pyramid patch is must less likely to jam due to pleating. One reason conventional patches get stuck is unwanted 5-layer pleating. The special notches in the Pyramid patch remove all or most 5-layer pleating. As a result the patch does not bunch up and this also reduces rod bowing.
Triangle Patch Function and Geometry Explained (See 1:18 time-mark):
NOTE: Despite what you may see in this video, you should ALWAYS insert brushes and patches from the chamber end first, using a fitted cleaning rod bore guide. With bolt-action rifles, NEVER insert a cleaning rod (with brush or jag) in through the muzzle. This may damage the delicate crown of your barrel.
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May 16 — NRA Foundation Banquet and Auction
The CMP has opened 
Forum member JAS-AS purchased a .22 Magnum CZ which he revived as a training rig with a new stock. He posted: “I use a CZ457 in .22 Magnum mainly as a trainer — bipod and rear bag kind of stuff. It has evolved over the last year or so. Next change will be a Lilja barrel. This because it can shoot brilliantly (at times) but not consistently. And accuracy degrades as it gets minimally dirty. Also, it doesn’t like 40gr rounds — the groups open up to 1.5 MOA. It’s at its best with 30 and 35 grain rounds running at up to 2250 fps. I believe that to be a twist-rate issue.”
Bullet 1 (L-R), the RN/FB, has a very slight taper and only reaches its full diameter (0.284 inch) very near the cannelure. This taper is often seen on similar bullets; it helps reduce pressures with good accuracy. The calculated BSL of Bullet 1 was ~0.324″. The BSL of Bullet 2, in the center, was ~0.430″, and Bullet 3’s was ~ 0.463″. Obviously, bullets can be visually deceiving as to BSL!
