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August 2nd, 2022

Case Prep — Primer Pocket and Flash-Hole Conditioning

USAMU Handloading hump day flash hole primer pocket uniforming case prep RCBS Lyman
Case Prep Xpress photo courtesy Lyman Products.

In the past the U.S. Army Marksmanship Unit published a series of reloading “how-to” articles on its USAMU Facebook page. One “Handloading Hump Day” article covered two basic case prep chores — uniforming primer pockets and deburring flash-holes. Visit the USAMU Facebook page for other tips.

USAMU Handloading hump day reloading tips

Primer Pocket & Flash-Hole Conditioning

This week, we’ll address a question that frequently arises: “Do you uniform primer pockets and deburr flash-holes?” As we tailor our handloading methods to the specific needs of each instance, the answer, not surprisingly, is “Sometimes!” However, don’t flip that dial just yet, as what determines our approach may be helpful in deciding how to address one’s own techniques. Moreover, we have a buried “Easter Egg” morsel that may bring a chuckle, as well as useful safety information!

Generally, the USAMU Handloading Shop does not uniform primer pockets (PP) or deburr flash holes (FH) of our rifle brass. We’re certainly not against it… Rather, this reflects the very high volume of ammunition we load, the fact that very few cases are ever re-loaded for a second firing, and the types of brass we use. However, as a need is perceived, we DO deburr flash holes. Of interest, we have fired many very small, 1000-yard test groups and aggregates using weight-selected, domestic brass that had not had PPs uniformed or FHs deburred.

USAMU Handloading hump day flash hole primer pocket uniforming case prep RCBS Lyman

Before and After — On the left is a fired, deprimed 7.62×51 case with primer residue intact. On the right the primer pocket has been uniformed to SAAMI specs. Note the shiny finish at the bottom of the pocket — evidence of the the removal of metal when uniforming the primer pocket.

As to the type cases we use, many thousands of our long-range 5.56mm cases come to us from the arsenal with the primer of our choice pre-installed and staked-in, per usual practice. Obviously, we cannot uniform either FHs or PPs on this live, primed brass. However, after careful sorting, inspection and preparation, we do obtain match-winning results with it.

Shooters who reload their brass several times may decide to uniform PPs and deburr FHs, especially on their “300-yard and beyond” brass. Here, they will use the cases many times, while the uniforming is performed only once. Also, most handloaders only process moderate amounts of brass, compared to our multi-thousand round lots.

Having high quality Long Range (LR) brass helps. Many of the better brass manufacturers [make] their flash holes so that no burrs are created. Still, it does pay to inspect even THESE manufacturer’s products, as occasional slips are inevitable. Very rarely, some of the best makers will have a significant burr in, say, 1 per 1000 or 2000 cases, and it’s worth catching those.

Exceptions can always be found. Recently, we began processing a large lot of match brass from a premier manufacturer. We were startled to find that every case had a significant burr in the FH — something we’d never before seen from this maker. We then broke out the FH deburring tools and went to work.

Some observers have noted that it can be difficult to truly verify the contribution to accuracy of these procedures — particularly when firing from the shoulder, in conditions. Members of this staff, as individual rifle competitors, do often perform these operations on their privately-owned LR rifle brass. One could ascribe this to the old High Power Rifle maxim that “if you think it helps, then it helps.”

However, a World Champion and Olympic Gold/Silver medalist here commented on his own handloading (for International competition, which demands VERY fine accuracy). He noted that he did seem to see a decline in accuracy whenever he did not uniform FHs, deburr FHs and clean primer pockets before each reloading. (One might be tempted to counter that only a truly World Class shooter could reliably detect the difference.) However, with the wisdom of decades experience, our Champion also remarked that “It could have been that I just wasn’t shooting as well that day.”

For those who do opt for these procedures, note that various tool models may have adjustable depth-stops; pay attention to the instructions. Some FH-deburring tools (which enter the case mouth, not the primer pocket) are dependent upon uniform case length for best results.

USAMU Handloading hump day flash hole primer pocket uniforming case prep RCBS Lyman

Above is a flash-hole deburring tool on an RCBS powered case-prep unit. These case prep machines can save a lot of pain and misery, helping one perform various functions quickly and efficiently.

Permalink Bullets, Brass, Ammo, Reloading, Tech Tip No Comments »
August 2nd, 2022

How Suppressors Are Manufactured — Start to Finish Video

SilencerCo suppressor manufacturing production video Assembly

Watch this video to see how a sound suppressor (aka “silencer”, “moderator”, or “can”) is constructed, start to finish. It’s more complicated than you might expect — there are quite a few stages in the process. The video below shows the fabrication of a SilencerCo Octane 45 suppressor:

SilencerCo writes: “What, exactly, goes into making a silencer? It may be more than you’d expect. From cutting metal to chemical baths, to extensive quality control every step of the way, our streamlined process is more than just a few steps. Watch our newest video, HOW IT’S MADE: Octane 45, to catch a glimpse behind SilencerCo’s doors.”

SilencerCo suppressor
Photo courtesy UltimateReloader.com.

suppressor fact and fiction moderator silencer

How Loud Are Unsuppressed Rifles?
Firearms Are Loud — 140 dB to 175 dB. ASHA explains: “Almost all firearms create noise that is over the 140-dB level. Exposure to noise greater than 140 dB can permanently damage hearing. A small .22-caliber rifle can produce noise around 140 dB, while big-bore rifles and pistols can produce sound over 175 dB. Firing guns in a place where sounds can reverberate, or bounce off walls and other structures, can make noises louder and increase the risk of hearing loss. Also, adding muzzle brakes or other modifications can make the firearm louder. People who do not wear hearing protection while shooting can suffer a severe hearing loss with as little as one shot[.]” Source: ASHA, Recreational Firearm Noise Exposure.

How Much Does a Good Suppressor Really Reduce Firearm Sound Levels?
That depends on the rifle, the cartridge, and the effectiveness of the suppressor. American Hunter explains: “Suppressors retard the speed of propellant gases from the cartridge that rapidly expand and rush out of the barrel. It’s these gases that produce the loud boom that’s heard for miles. A suppressor’s series of internal baffles slows these gases so they are not all released at once, thereby muffling the sound.” Many good commercial suppressors can achieve 30-35 dB sound suppression. However, Zak Smith of Thunder Beast Arms says: “There are a bunch of manufacturers who publish values that are not reproducible, or use an ad-hoc test instead of a mil-spec test. In many cases we’ve tested the exact same suppressors they’ve advertised with 30-40 dB reductions and found they are actually in the high 20s instead.”

Again, for this reason, we recommend that hunters use ear protection, such as electronic muffs, even when shooting suppressed.

Permalink - Videos, Gear Review, Tactical, Tech Tip No Comments »
August 2nd, 2022

Gun Digest 2023 Annual Available Soon — Pre-Order Now

Gun Digest 2023 77th Annual 592-page Gun book

This is a great resource for firearms fans. The Gun Digest 2023, 77th Edition, can be pre-ordered now for $37.99 through the Gun Digest store or Amazon.com. Gun Digest states “Orders Anticipated To Ship Early August 2022″, while Amazon lists a 9/6/2022 publication date.

This 592-page resource covers rifles, shotguns, handguns, muzzleloaders, airguns, optics and more. We like the print edition, but there is also a Kindle eBook version for $16.00 on Amazon. Both paperback and Kindle versions provide hundreds of photos plus new product roundups, in-depth product tests, and scores of articles and stories.

Gun Digest 2023 Editor-in-Chief Phil Massaro has assembled a large team of respected industry authors for the new book, including Craig Boddington, Joe Coogan, Ron Spomer, Patrick Sweeney, Jim Supica, Thomas Gomez, Tom Turpin, Wayne van Zwoll, Bob Campbell and many more.

Gun Digest 2023 covers hunting, personal defense, target shooting, gunsmithing, and collecting. Historical articles look at the role played by firearms in our country. There are Updated Ballistics Tables, and the catalog section shows off the newest offerings in rifles, handguns, shotguns, muzzleloaders and air rifles. Here are some of the key topics from last year’s 2022 edition:

Gun Digest 2022 76th Annual 592-page Gun book

Reports from the Field cover the newest firearms and accessories. A Testfire section brings readers up to date on product performance. And the annual photo essay spotlights the finest custom and engraved guns.

Other Good Books from Gun Digest Media
Gun Digest Media produces numerous other quality books for rifle, pistol, and shotgun owners. Here are four volumes we recommend. These are offered in both paperback and eBook versions:

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Permalink Hunting/Varminting, New Product, News 1 Comment »