July 18th, 2014

Neck Bushing Geometry — How Good Are YOUR Bushings?

Do you use bushings to size your case-necks? Are you assuming that your bushings are actually round on the inside, with a hole that’s centered-up properly? Well you may be in for an unpleasant surprise, based on what our friend Jim de Kort recently discovered. Jim was concerned about the run-out on his brass. His cases went into his bushing-equipped FL die pretty straight, but came out of the die with up to .004″ run-out. “What gives?”, Jim wondered. “Could the problem be the bushings themselves?”

To answer that question, Jim decided to examine his bushings. Using an Accuracy One Wheel-drive concentricity gauge, Jim checked out some of his neck bushings. What he discovered may surprise you…


Neck Bushing Flaws Revealed

Trust no one… — Jim de Kort

Jim writes: “I measured the concentricity of my 6BR rounds today. I noticed they went into the neck-bushing equipped full-length sizing die with <.001" deviation but came out with .003-.004". The culprit, it appears, was the bushing itself. Without it the cases stayed within .0005" to .001" deviation, so something was happening with the bushing. One bushing had .00025" deviation on the outside, yet almost .003" on the inside, so it is crooked. But even when using a bushing that is within .001" I still get .003" runout after sizing. I repeated the same procedure for my 6x47 and got the same results. When using the bushing, concentricity suffers a lot." Before we bash the bushing-makers, we must acknowledge that many different things can contribute to excessive run-out and/or mis-alignment of case-necks. We don’t have all the answers here, and Jim would be the first to say that some mysteries remain. Still, these are interesting results that give all precision hand-loaders something to think about.

Jim Borden also offers this tip: “Check the trueness of the face of the die cap. That has more to do with trueness than the bushing. Also check perpendicularity of hole in bushing to top surface. When I was making dies, the cap was made by threading and facing the threaded tenon in same setup.”

bushing neck die run-out concentricity


Editor’s Comment: Many people have great results with neck-bushing dies, but Jim isn’t the only fellow who has seen some very odd results. I personally employ honed, non-bushing dies for many of my chamberings. These non-bushing dies (with the necks honed for .002-.003″ neck tension) produce extremely straight ammo, with run-out consistently under .0015″.

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July 18th, 2014

USAMU Teaches 472 Shooters at Small Arms Firing School

A great time was had by boys and girls, men and women, young and old alike at the 2014 Small Arms Firing School (SAFS) held July 17, 2014 at Camp Perry. This year’s SAFS was a great learning experience for the hundreds of participants, ranging in age from 7 to 70.

small arms firing school camp perry cmp usamu

Military Rifle Coaches and CMP Rifle Master Instructors taught marksmanship basics and fundamentals to some 472 rifle marksmen (and “markswomen”). The U.S. Army Marksmanship Unit (USAMU) Rifle Team Members conducted a classroom session in the morning, and then the Army Rifle Coaches provided “world-class” instruction on the firing line. The Rifle SAFS concluded with the Rifle Excellence in Competition (EIC) Match. SEE Match Results.

small arms firing school camp perry cmp usamu

Here are photos from the CMP SAFS Photo Gallery. CLICK HERE to see hundreds more images …

small arms firing school camp perry cmp usamu

small arms firing school camp perry cmp usamu

small arms firing school camp perry cmp usamu

small arms firing school camp perry cmp usamu

small arms firing school camp perry cmp usamu

small arms firing school camp perry cmp usamu

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July 18th, 2014

Alltop.com Collects Latest Gun News

Starved for shooting news and gun-related content on the web? There are dozens of gun blogs and firearms news sources, but it can be cumbersome and time-consuming to visit more than a few sites on a daily basis. Alltop.com changes all that. This automated site scans 30+ gun websites and links to current articles. Among the sites included are: NRA Blog, NRA-ILA News, Ammoland Gun News, The Firearm Blog, USA Carry, and yes, of course, our very own Daily Bulletin.

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If you like stay up with the latest gun rights news, or just peruse a variety of gun-related content sites, Alltop.com can help you source interesting articles quickly and efficiently.

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