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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
AR 10 POPPING FACTORY AMMO PRIMERS
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<blockquote data-quote="Frog4aday" data-source="post: 1655728" data-attributes="member: 9308"><p>Seems like I was hearing about pierced primers in AR-10 (SR-25s) when I was building my .338 Federal (AeroPrecision), mostly in the .260 Rem/6.5 Creed guns. The consensus was the firing pin hole in the bolt was a 'tad' too big, so you need a smaller hole in the bolt and a smaller firing pin to match.</p><p></p><p>This thread got me thinking about that so I did a Google search and came across this from the <u><em>Western Powder</em></u> page. You really need to click the link and read the whole thing, but this excerpt below gets to the heart of the matter.</p><p><a href="http://blog.westernpowders.com/2019/02/cratered-and-pierced-primers-in-the-308-ar-family/" target="_blank">http://blog.westernpowders.com/2019/02/cratered-and-pierced-primers-in-the-308-ar-family/</a></p><p><strong>"Cratered and pierced primers" is not uncommon even in bolts guns. The most common solution is to reduce the firing pin aperture and firing pin diameters. There are vendors that provide the service of reducing the firing pin and aperture diameters ("bushing down the diameters") in bolt guns such as Gre-Tan Rifles. A simple analysis shows that a .0625" diameter firing pin aperture is 42% smaller in cross sectional area than the standard AR10 .082" aperture and will reduce the linear force the same 42% on a primer cup over this aperture from 317 pounds to 184 pounds assuming a 60,000 psi chamber pressure.</strong></p><p><strong></strong></p><p> <strong></strong></p><p><strong>JP Enterprises is one among others that provide a solution for this issue. JP describes their solution as a "high pressure" Enhanced Bolt™ for the .308 AR. It has a .060"-062" diameter firing pin and firing pin aperture (see Figure 5 and 6).</strong></p><p><strong>[ATTACH=full]138190[/ATTACH]</strong></p><p><strong>[ATTACH=full]138191[/ATTACH] </strong></p></blockquote><p></p>
[QUOTE="Frog4aday, post: 1655728, member: 9308"] Seems like I was hearing about pierced primers in AR-10 (SR-25s) when I was building my .338 Federal (AeroPrecision), mostly in the .260 Rem/6.5 Creed guns. The consensus was the firing pin hole in the bolt was a 'tad' too big, so you need a smaller hole in the bolt and a smaller firing pin to match. This thread got me thinking about that so I did a Google search and came across this from the [U][I]Western Powder[/I][/U] page. You really need to click the link and read the whole thing, but this excerpt below gets to the heart of the matter. [URL]http://blog.westernpowders.com/2019/02/cratered-and-pierced-primers-in-the-308-ar-family/[/URL] [B]“Cratered and pierced primers” is not uncommon even in bolts guns. The most common solution is to reduce the firing pin aperture and firing pin diameters. There are vendors that provide the service of reducing the firing pin and aperture diameters (“bushing down the diameters”) in bolt guns such as Gre-Tan Rifles. A simple analysis shows that a .0625” diameter firing pin aperture is 42% smaller in cross sectional area than the standard AR10 .082” aperture and will reduce the linear force the same 42% on a primer cup over this aperture from 317 pounds to 184 pounds assuming a 60,000 psi chamber pressure. JP Enterprises is one among others that provide a solution for this issue. JP describes their solution as a “high pressure” Enhanced Bolt™ for the .308 AR. It has a .060”-062” diameter firing pin and firing pin aperture (see Figure 5 and 6). [ATTACH=full]138190[/ATTACH] [ATTACH=full]138191[/ATTACH] [/B] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
AR 10 POPPING FACTORY AMMO PRIMERS
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