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December 16th, 2025

Innovative Triangle Cleaning Patches Have Many Advantages

Rigel BoreSmith Brush Patch Jag Pyramid Triangle patches

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 Triangle 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.

Rigel BoreSmith Brush Patch Jag Pyramid Triangle patchesBoreSmith’s 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). Also the Pyramid patch is much 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.

The Triangle patch can be used with a standard jag but works best when paired with BoreSmith’s patented dual-diameter JagBrush. There are FOUR patch sizes: 17-20 Caliber, 22-27 Caliber, 27-35 Caliber, and 35-58 Caliber.

» Combo Kits with Triangle Patches and Dual-Diameter Brushes

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.

The Triangle Patches work great with Boresmith’s patented dual-diameter bore brushes:

Triangle triangular patches boresmith
Triangle triangular patches boresmith

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December 15th, 2025

BargainFinder 534: AccurateShooter’s Deals of the Week

AccurateShooter Deals of the Week Weekly Bargain Finder Sale Discount Savings

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.

EuroOptic — 12 Days of Christmas Sale on Guns, Gear & More

eurooptic 12 days of Christmas sale opticsrifles
⏺️ » Big discounts through 12/19/2025 — Optics, Rifles, Pistols and more

For the first time ever EuroOptic.com presents its big, sitewide 12 Days of Christmas sales event. Special savings are published daily through 12/19/2025. There are major discounts on optics, rifles, pistols, hunting gear and more. Check out the featured Daily Deals through December 19, 2025:

Day 1: Riflescopes
Day 2: Thermals
Day 3: Pistols
Day 4: Glasses
Day 5: Crossbows
Day 6: Boots/Footwear
Day 7: AR-Type Rifles
Day 8: Binoculars
Day 9: TBA
Day 10: TBA
Day 11: TBA
Day 12: TBA

Sportsman’s Warehouse — Major Product Doorbuster Sale

lyman sitewide sale
⏺️ » Optics, handguns, ammo, hunting gear, triggers, tools and more

If you need quality guns, hunting gear, reloading tools, optics, rangefinders, and more, then check out the major Doorbuster Sale now at Sportsman’s Warehouse. Among the fantastic deals are 60% off many optics, $275 off Colt pistols, and $250 off Garmin In-reach Satellite GPS devices.

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December 15th, 2025

Always Check for Bullet Tip Contact with Seating Die Stems

Seating Stem Glen Zediker

Clearance Check — Remove the seating stem and drop a bullet into it. The farther down the ogive or nose-cone the step recess grips the bullet, the better. If it’s only pressing down against the bullet tip, a crooked seat is assured, along with inconsistent seating depth. — Glen Zediker

Some folks acquire a new seating die and then are surprised to find their hand-loads show crooked bullets and/or inconsistent seating depth. The problem could be a mis-match between the bullet and the die’s seating stem. In some case, particularly with long, streamlined bullets, the bullet tip can actually touch the bottom inside of the stem. This can cause a variety of problems, as Glen Zediker explains…

Invest in a Good Seating Die
Reloading Tip by Glen Zediker
The bullet seating operation is the “last thing” that happens and it’s also the one thing that can corrupt the care and treatment given to the quality of the loaded round prior. A sleeve-style seater, well-machined, goes a whopping long ways toward preserving alignment, and, therefore, concentricity. Also make sure that the stem in yours comes to rest well down onto the bullet ogive, and, above all else, is not contacting the bullet tip! That will wreck a round.

If you have this problem, you should contact the die maker — some will offer a different seating stem expressly designed for longer, pointier bullets. This “long bullet stem” will normally drop right into your existing die. If you plan to run long, VLD-style bullets you should request the special seating stem right from the get-go.

NOTE: Glen Zediker passed away in October 2020. He will be missed — his books were important additions to the gun world’s knowledge base. This tip comes from Glen’s book, Top-Grade Ammo, now out of print.

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December 14th, 2025

TEN Most Common Reloading Mistakes — Agree with This List?

Shooting Times Reloading Failures Mistakes Top Ten 10

A while back, Shooting Times released an article entitled “Ten Most Common Reloading Mistakes”. Listed below are the Top Ten mistakes hand-loaders can make, at least according to Shooting Times. What do you think of this list — does it overlook some important items?

Top Ten Reloading Mistakes According to Shooting Times:

1. Cracked Cases — Reloaders need to inspect brass and cull cases with cracks.

2. Dented Cases — Dents or divets can be caused by excess case lube.

3. Excessive Powder Charge — Overcharges (even with the correct powder) can be very dangerous.

4. Primers Not Seated Deep Enough — “High” primers can cause functioning issues.

5. Crushed Primers — Some priming devices can deform primers when seating.

6. Excess Brass Length — Over time, cases stretch. Cases need to be trimmed and sized.

7. Bullets Seated Too Far Out — If the bullet is seated too long you may not even be able to chamber the round. Also, with hunting rounds, bullets should not engage the rifling.

8. Burrs on Case Mouths — Ragged edges on case mouths can actually shave bullet jackets.

9. Excess Crimp — This is a common problem with pistol rounds loaded on progressives. If case lengths are not uniform some cases will get too much crimp, others too little.

10. Inadequate Crimp — This can be an issue with magnum pistol cartridges in revolvers.

Do you agree with this list? We think some important things are missing, such as not adjusting full-length sizing dies properly. This can cause the shoulder to be pushed back too far (or not far enough). Another common mistake is using brass that is worn out, i.e. stretched in the case-head area from multiple cycles of hot loads. We also think the #1 error a reloader can make is using the wrong powder altogether. That can be a fatal mistake. See what happens when you load pistol powder in a rifle.

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December 13th, 2025

Amazing SAAMI Test — What Really Happens When Ammo Burns

With major forest fires this past year in Western states, many have wondered about hazards faced by gun owners in fire zones. This important video shows what really happens when loaded ammunition burns. You will probably be surprised. Contrary to Hollywood notions, the ammo doesn’t ignite in a massive explosion. Far from it… basically the rounds “cook off” one by one, and the bullets release at relatively low velocity. We’ve featured this SAAMI research project before, but it is worth reprising for those who have not yet seen the burn tests.

A few years back, SAAMI released an important video concerning ammo and fire. With professional fire-fighters standing by, over 400,000 rounds of ammo were incinerated in a series of eye-opening tests. If you haven’t had the chance to view this video yet, you should take the time to watch it now

The Sporting Arms and Ammunition Manufacturers’ Institute (SAAMI) has produced an amazing 25-minute video that shows what actually happens to sporting ammunition involved in a fire. This video shows the results of serious tests conducted with the assistance of professional fire crews. We strongly recommend you watch this video, all the way through. It dispels many myths, while demonstrating what really happens when ammunition is burned, dropped, or crushed.

Watch SAAMI Ammunition Testing Video

Video Timeline

  • 2:10 Impact Test (ignited outside firearm)
  • 3:40 65-foot Drop Test
  • 5:08 Bullet Impact (.308 Win firing)
  • 7:55 Blasting Cap Attacks
  • 9:55 Bulldozer and Forklift Tests
  • 12:20 Boxed Ammo Bonfire
  • 15:37 Bonfire without Packaging
  • 17:21 Retail Store Simulation Burn
  • 20:55 Truck Trailer Burn

Over 400,000 rounds of ammunition were used in the tests. Some of the footage is quite remarkable. Testers built a bonfire with 28,000 rounds of boxed ammo soaked in diesel fuel. Then the testers loaded five pallets of ammo (250,000 rounds) in the back of a semi-truck, and torched it all using wood and paper fire-starting materials doused with diesel fuel.

The video shows that, when ammo boxes are set on fire, and ammunition does discharge, the bullet normally exits at low speed and low pressure. SAAMI states: “Smokeless powders must be confined to propel a projectile at high velocity. When not in a firearm, projectile velocities are extremely low.” At distances of 10 meters, bullets launched from “cooked-off” ammo would not penetrate the normal “turn-out gear” worn by fire-fighters.

We are not suggesting you disregard the risks of ammo “cooking off” in a fire, but you will learn the realities of the situation by watching the video. There are some amazing demonstrations — including a simulated retail store fire with 115,000 rounds of ammo in boxes. As cartridges cook off, it sounds like a battery of machine-guns, but projectiles did not penetrate the “store” walls, or even two layers of sheet-rock. The fire crew puts out the “store fire” easily in under 20 seconds, just using water.

Additional Testing: Drop Test, Projectile Test, Crush Test, Blasting Cap Test

Drop Test
The video also offers interesting ammo-handling tests. Boxes of ammo were dropped from a height of 65 feet. Only a tiny fraction of the cartridges discharged, and there was no chain-fire. SAAMI concludes: “When dropped from extreme heights (65 feet), sporting ammunition is unlikely to ignite. If a cartridge ignites, it does not propagate.”

Rifle Fire Test
SAAMI’s testers even tried to blow up boxes of ammunition with rifle fire. Boxes of loaded ammo were shot with .308 Win rounds from 65 yards. The video includes fascinating slow-motion footage showing rounds penetrating boxes of rifle cartridges, pistol ammo, and shotgun shells. Individual cartridges that were penetrated were destroyed, but adjacent cartridges suffered little damage, other than some powder leakage. SAAMI observed: “Most of the ammunition did not ignite. When a cartridge did ignite, there was no chain reaction.”

Bulldozer Crush Test
The test team also did an amazing “crush-test” using a Bulldozer. First boxes of loaded ammo, then loose piles of ammo, were crushed under the treads of a Bulldozer. A handful of rounds fired off, but again there was no chain-fire, and no large explosion. SAAMI observed: “Even in the most extreme conditions of compression and friction, sporting ammunition is unlikely to ignite. [If it does ignite when crushed] it does not propagate.”

Blasting Cap Test
Perhaps most amazingly, the testers were not able to get ammunition to chain-fire (detonate all at once), even when using blasting caps affixed directly to live primers. In the SAAMI test, a blasting cap was placed on the primer of a round housed in a large box of ammo. One cartridge ignited but the rest of the boxed ammo was relatively undamaged and there was no propagation.

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December 13th, 2025

The World of Cartridges — Guide to Cartridge and Primer Types

pew pew tactical bullet cartridge photos rimfire primer illustration

The Pew Pew Tactical website has interesting article on rifle and pistol cartridges and bullet types. This contains a large selection of interesting photographs and illustrations. If you load and/or shoot for a wide variety of cartridge types, you’ll find that article well worth reading. It has nearly 50 photographs and more than a dozen short videos. READ FULL Article.

pew pew tactical bullet cartridge photos rimfire primer illustration

The article also shows all types of pistol bullets, along with a variety of rifle projectiles. It even illustrates multiple types of shotshell cartridges.

The article also explains the basic components of modern cartridges — bullet, case, powder, and primer:

ammunitiontogo.com ammo case cutaway
Photo courtesy Ammunitiontogo.com which sells ammo from many leading brands.

pew pew tactical bullet cartridge photos rimfire primer illustrationPopular Cartridge Types Profiled
The article provides quick summaries of popular ammunition types including 9mm Luger (9x19mm), .357 Magnum, .40 SW, .45 ACP, .223 Rem, and .308 Winchester. The author’s favorite pistol round is the 9mm Luger: “9mm is my personal favorite and if there was a “Goldilocks” round, this would be it. The very first gun I bought was a 9mm. They’re fun at the range. They’re good for defense. It is the standard round for NATO countries and the majority of police forces around the world. It is mild shooting, can vary in weight from 115 to 147 grains, and has varying stopping power based on the type of bullet.”

This Pew-Pew Tactical guide to cartridge types also provides a quick explanation of cartridge ignition — both centerfire and rimfire: “The rimfire’s primer is built into the rim while the centerfire cartridge has the primer in the center. Pro tip — if you can see a circle in the middle…it’s a centerfire cartridge.”

There are two common types of centerfire primers — Boxer and Berdan. This helpful Wikipedia illustration shows how Boxer, Berdan, and rimfire primers ignite the powder in the cartridge:


Berdan boxer rimfire primer gif animation illustration


This centerfire and rimfire ignition animation is by BBODO – Own work, CC BY-SA 3.0 licensed under the Creative Commons Attribution-Share Alike 3.0 license.

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December 8th, 2025

L.E. Wilson Case Gage Depth Micrometer Product Review

L.E. Wilson case gage gauge shoulder bump depth micrometer measureing tool

L.E. Wilson Case Gage Depth Micrometer Tool
Hands-On Tool Review by F-Class John
Are you looking for a better way to measure shoulder bump when sizing brass? When it comes to measuring your shoulder bump there has traditionally been just one way to do it and that’s with a set of calipers and some type of tool attached to a calipers jaw which contacts the case shoulder. While this method has worked well for decades there’s always been some inherent lack of consistency and repeatability. While a minor issue, the inability to get the exact number in completely dependent on the user’s pressure applied and the angle at which the jaws push on the brass.

Enter the L.E. Wilson Case Gage Depth Micrometer with its simple but effective use of Wilson case gauges to ensure a perfect measure of shoulder bump every time. The unit comes with the micrometer top as well as a check gauge which allows you to easily calibrate the micrometer whenever needed. On top of the micrometer unit, you’ll also need to purchase the appropriate case gauges for each of your cartridge types and then you’re ready to go. No other measuring instruments are needed (yep, no calipers are required).

L.E. Wilson case gage gauge shoulder bump depth micrometer measureing tool

Using the Wilson Depth Micrometer (perhaps a better name is Shoulder Bump Micrometer) is a straightforward process. Simply take your fired brass and insert it into the case gauge and place the micrometer top onto the primer side of the gauge. While holding the micrometer top firmly against the case gauge in one hand, slowly turn the micrometer until you feel it stop. You can back off and turn it again to verify the stop point and once you have it, look at the measurement on the micrometer. Now insert a sized piece of brass and repeat the procedure. Take note of the new number and subtract it from the fired brass number and you now have an exact amount of shoulder bump. Continue to adjust your sizing die until you have the correct amount of shoulder bump and you’re ready to size all your brass.

Watch Video to See how Shoulder-Bump Measuring Micrometer Tool Works

Guys, in this case a VIDEO is worth more than a thousand words. In may not be obvious from the photos how this system works. In fact, it is fast and easy. Drop brass into cartridge-specific case gauge, then put the Micrometer unit on top, and dial to touch. The video shows how this works.

SUMMARY — Tool is Fast, Precise, Repeatable, and Easy to Use — We Like It
The beauty of this tool is the simplicity with which it works. It uses a very accurate micrometer to simply measure how much further your brass is sitting forward inside the case gauge. After a couple uses, you’ll find that this tool is fast, accurate and incredibly repeatable. That gives you confidence that your brass is being sized properly. Ultimately, I found that using the micrometer top really became a joy as I set up a new set of dies and as I sized my brass, I could easily check the consistency as brass came off my press. If you’re looking to improve your sizing game, give the L.E. Wilson Case Gage Depth Micrometer a try. MSRP is $140.00.

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December 7th, 2025

Sierra Reloading Data Book Edition VI Is Available Now

sierra 6th edition VI reloading manual book resource binder

sierra 6th edition VI reloading manual book resource binderThe highly respected Sierra Rifle & Handgun Reloading Data Book VI (6th edition) is back in stock at multiple online vendors. This handy binder-style resource covers hundreds of popular cartridges with data from a huge variety of powder types. This manual provides proven loads, ballistic data, and detailed cartridge specifications.

The Sierra 6th Edition Manual is offered for $50.99 at Sierrabullets.com (SKU 0600), $46.99 at BassPro, or $47.99 at MidwayUSA. A few are in stock on Amazon for $60.45 with free delivery. If they sell out, go to the Sierra online store or BassPro.

More Printed Resources
Good reloading data is available in online databases (e.g. HodgdonReloading.com) and in printed book formats. If you prefer print format reloading resources, along with the excellent Sierra Guide, consider these six (6) printed manuals:

Nosler Reloading Guide 9 Manual, $35.99 at MidwayUSA
LEE Modern Reloading, 2nd Edition, $18.49 at MidwayUSA
Speer Reloading Manual, Number 15, $35.99 at MidwayUSA
Berger Reloading Manual (1st Edition), $25.99 at MidwayUSA
Lyman Reloading Handbook 51st Edition, $24.99 at MidwayUSA
Hornady Handbook of Cartridge Reloading, 11th Edition, $24.74 at MidwayUSA

It’s Wise to Consult Multiple Reloading Resources

If you want the best (and safest) results when loading rifle and pistol ammo, this helpful video explains why you may want to reference multiple reloading guides and/or online load databases.

CLICK HERE for full selection of Reloading Manuals, Cartridge Load Guides, and DVD kits (over 30 reloading resources).

midwayusa reloading book resources

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December 6th, 2025

Saturday Movies: Priming Tools and Techniques Videos

video primer priming seater tool video review primal rcbs lee hand bench

Seating primers is a key part of the reloading process. You need to seat primers consistently to achieve best accuracy. There are many different tools offered for seating primers, both hand-held and bench-mounted. Deluxe premium hand-held seaters may hold just a single primer, while a variety of handheld units employ trays to hold more primers. With bench-mounted primer seaters there are a variety of feeding systems — vertical tubes, angled trays, and even a strip feeder — the APS system pioneered by RCBS.

Today’s Saturday at the Movies feature covers a variety of primer seater options, from low-cost hand tools to the $600.00 Primal Rights unit. We also cover the innovative Lee Automated Case Primer (ACP) system which even feeds your brass, increasing your processing rate.

Forster Co-Ax Bench-Mounted Priming Tool

The Forster Co-Ax® Primer Seater is a trusted bench-mounted priming tool that works very well. Set the jaws for a particular rim size, load the tube, and you’re ready to seat primers. The tool has good “feel” plus plenty of leverage. Forster says that the tool’s “unique design allows the operator to eliminate all slop when working with a specific cartridge, translating into perfect seating, reliable ignition, and reduced misfires.” This Forster tool requires no separate shell holders. The spring-loaded jaws close to securely grip most modern rifle and pistol cases with a rim thickness of .045″ to .072″. And Forster provides a primer flipper tray that makes it easy to load the provided small and large tubes. If you shoot a large variety of cartridge types with various rim sizes, this Forster Co-Ax primer seater is a good choice.

Primal Rights Competition Priming Seater (CPS) Review

If there is a Ferrari of priming tools, it has to be the Primal Rights Competition Primer Seater (CPS). This impressive bench-mounted tool allows very precise control over primer seating depth. A vertical tube holds primers ready for insertion. The action is smooth and precise. Seating depth control is as good as you can get. That precise, repeatable control, and the tool’s smooth operation, are the tool’s major selling points. Video reviewer F-Class John believes that Primal Rights machine is definitely the best priming tool on the market, though it may not be for everyone given its premium $600.00 price.

Frankford Arsenal Perfect Priming Tool

Our friend Jim See of Elite Accuracy LLC has tested the depth-adjustable hand priming tool from Frankford Arsenal. This product, called the Platinum Series Perfect Seat Hand Primer, has some unique features. Primer seating depth can be adjusted with a handy wheel in the tool’s center handgrip. Each “click” of the wheel moves the primer post .001″ (one one-thousandth of an inch). Additionally, the design of the case-holder allows quick and easy removal of a primed case. The unit ships with a full set of shell-holders to match all types of cases. Like many other hand priming units, the primers are loaded into a flip tray that attaches to the head of the tool.

Frankford Arsenal Perfect Priming Tool jim see review

Accuracy Variances and Priming Tool Types

The above video compares the performance of the Frankford Arsensal adjustable priming tool with a Sinclair Int’l hand priming tool — a unit used for many years by top benchrest shooters.

LEE Auto Bench Priming Tool

Gavin Gear of UltimateReloader.com has reviewed Lee Precision’s new lever-operated, bench-mounted priming tool. The Lee Auto Bench Prime features a hopper-style primer feeder set at an angle. Gavin likes the tool, reporting that primers feed well and seat fully with very little effort. And switching from large to small primer size (or vice-versa) is quick and easy. Overall, Gavin says the Lee Auto Bench Prime has earned a place in his reloading room: “The Lee Auto Bench Prime is easier to use than a hand priming tool, and more efficient.”

How the Lee Auto Bench Prime Performs
Gavin had three important “take-aways” from his initial loading sessions with the Lee Auto Bench Prime:

1. I was surprised by the low effort needed to prime cases — it’s pretty amazing.
2. You can quickly and easily install shellholders and change primer sizes.
3. The folding primer tray works very well. It’s a great setup from my testing so far.

Are there any negatives with the tool? Gavin noted that, in the course of loading 100+ rounds, once or twice he had to tap the triangular tray to get the primer to feed: “That’s not a big deal, and may smooth out with time”.

RCBS APS Strip Priming System — Bench Tool and Strip Loader

rcbs aps strip priming system hand toolRCBS pioneered an innovative priming system that held primers in handy horizontal strips. This video shows primers being placed in strips, and then cases being primed using an RCBS bench-mounted APS strip-priming system. Many years ago, this Editor acquired an RCBS Pro 2000 progressive press, which employed the APS strip priming system. Primers were held in strips which could be easily connected for continuous feeding — no tubes to load! I liked the system so much I then acquired an APS hand priming tool (photo right), an APS bench-mounted tool, and an APS strip priming tool that fits on a single stage press. I loaded many thousands of rounds successfully with the APS system with not one inverted primer ever. I still use the APS hand primer tool to prime most of my rifle rounds.

video primer priming seater tool video review primal rcbs lee hand bench

Unfortunately, RCBS has discontinued sales of most APS priming tools, but you can still get primers pre-packaged in APS strips, and you can still buy the Strip Loader tool for placing primers into strips.

BONUS Video — K&M Primer Pocket Correction Tool

K&M offers a handy tool for optimizing primer pocket depth. K&M’s Primer Pocket Correction Tool uses a carbide cutter with a preset depth, allowing consistent depth squaring of the primer pocket bottom. Designed with a drive shank to be used with your cordless screwdriver and/or a K&M handle, these tools are available in four types: Small Rifle/Pistol; Large Pistol; Large Rifle; and .50 BMG.

Priming Tool Tip — Check Your Primer Seater for Wear

Priming Tool APS CCI magnum Primers Lee RCBS Priming

From time to time, we all encounter a primer that doesn’t go off. It’s normal to attribute the problem to a bad primer. But sometimes there are other explanations. George S., one of our Forum members, experienced a couple failures to fire, but he learned that the issue was his priming TOOL, not his primers. Here’s what George told us. There’s a lesson to be learned:

“I had issues with CCI 450s when I had my first 6BR barreled. I had probably three or four out of 20 rounds that failed to fire. the primers were dented but didn’t fire. I called CCI since I had bought a case of them. The tech was decent enough but had the audacity to tell me I was not seating the primers all the way in the pocket. I proceeded to let him know I had been reloading longer than he had been alive and I knew how to seat a primer.

Turns out that I did and I didn’t! I was using the RCBS primer tool I had used for years and the primers felt just fine to me. I finally decided to check the tool and since I had a new one I took the seating pins out and measured them. The seating pin on the tool I had been using for years was shorter by a few thousandths! I then used the pin from the new primer tool and darned if the primers that didn’t seat down to the bottom of the cup.

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December 5th, 2025

6mm ARC — Efficient 6mm Cartridge That Works in AR15s

6mm ARC brownells bolts cartridge loaded ammunition hornady

In June 2020, Hornady introduced the 6mm ARC, a new SAAMI cartridge optimized for AR-platform rifles*. The new 6mm ARC is basically a 6.5 Grendel necked down to 6mm, with the shoulder moved back around .030″. That pushed-back shoulder does reduce case capacity (and velocity), but we assume Hornady did that to create a shorter, proprietary chamber so people could not simply neck-down Lapua 6.5 Grendel brass, as has been done for years with Robert Whitley’s outstanding 6mm AR wildcat.

CLICK Image for official SAAMI Specifications:
6mm ARC brownells bolts cartridge loaded ammunition hornady

If you are intrigued by the 6mm ARC, you’ll find the products you need at Brownells — barrels, bolts, mags and even complete 6mm ARC Rifles. Midsouth has 6mm ARC ammo and reloading dies. For general information, see 6mm ARC Wikipedia Info Page.

What Is the 6mm ARC Cartridge?
6mm ARC brownells bolts cartridge loaded ammunition hornadyThe 6mm ARC cartridge is a new SAAMI-spec cartridge based on the 6.5 Grendel case necked down for 6mm bullets, with the shoulder moved back 0.030. Yes it is designed to run in AR15-platform rifles. You’ll need a new barrel, bolt, and mags. If you already have an AR chambered in 6.5 Grendel, the ONLY thing you need to change is the barrel. Everything else — bolt, magazines, gas system – is compatible with 6mm ARC.

▶ Official SAAMI Cartridge (not wildcat)
▶ Fits standard AR15-platform rifles
▶ Fits Short/Mini action bolt rifles
▶ Efficient short, fat case design
▶ 30-degree case shoulder

For more INFO, see 6mm ARC Info Page.

What Do I Need To Shoot the 6mm ARC?
Faxon and Ballistic Advantage are already producing barrels, with more manufacturers sure to follow. All the other required components are already on the market for 6.5 Grendel rifles. Aero Precision already offers complete 6mm ARC uppers.

If you’re converting a standard 5.56×45 mm (.223 Rem) AR15 upper to shoot 6mm ARC, you’ll need a 6mm barrel, a Type II 6.5 Grendel bolt carrier group, and new magazines. Some folks have suggested standard AR mags will work, but trust us, you want the magazines that have been designed for 6.5 Grendel. Most of the hardware you need is available at Brownells.

6mm ARC brownells bolts cartridge loaded ammunition hornady

6mm ARC Videos from Hornady (18 Total)

6mm ARC: Overview
6mm ARC: Handloading
6mm ARC Initial Offerings
6mm ARC: AR-15 vs AR-10
6mm ARC vs. 6.5 Grendel
6mm ARC vs the Creedmoors
6mm ARC: 6.5 Creedmoor of the Gas Gun World
6mm ARC vs 308 WIN
6mm ARC: How it started

6mm ARC: What is it
6mm ARC: Military Application
6mm ARC vs. 6.8 SPC
6mm ARC: Bolt Gun Application
6mm ARC: Cartridge Design
6mm ARC: Best AR-15 Cartridge
6mm ARC: Hunting
6mm ARC: Match
6mm ARC: Barrel Length


* While 6-6.5 Grendel shooters are known to run stout pressures, the new 6mm ARC cartridge has a relatively moderate Maximum Average Pressure (MAP) rating of 52,000 psi according to the official SAAMI specifications. For a variety of reasons, is wise to keep pressures in a semi-auto rifle moderate. Don’t chase the velocities you might get in a bolt-action gun.

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