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Factory Ammo Pierced Primer
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<blockquote data-quote="CatShooter" data-source="post: 163125" data-attributes="member: 7"><p>Contrary to some of the "guesses"... it is clearly NOT an oversized pin hole.</p><p></p><p>With an oversized firing pin hole, you get cratering with rounded edges on the outside of the crater, even on light loads. There is no (as in ZERO) cratering on the case that did not perforate... there is nothing wrong with the firing pin hole. The pin to hole fit is fine.</p><p></p><p>Both primers look flatter than that usually seen with factory ammo, that might be the first clue. Keep in mind that S&B, and other European ammo makers, load to a higher standard (CIP), instead of the US standard (SAAMI). There is 5 to 10 Kpsia difference. Not dangerous, but it does add to the pot</p><p></p><p>The flattening could be due to a maximum chamber and minimum case, as a flattened outside primer edge is common with Max chamber and Min case.</p><p></p><p>But when primers perforate like that, it is because the pressure was so high, that it pushed the pin WAY back into the bolt, far enough so that the plug from the primer was inside the bolt... that is HIGH PRESSURE.</p><p></p><p>This type of perforation can happen if the firing pin spring is weak. (I had this happen a few weeks ago in a Rem 40XBBR, and replaced the spring, and the problem stopped. It was 33 years old... ).</p><p></p><p>But if you have no reason to suspect the spring, and considering that the primers are flattened, I would suspect that the S&B ammo is giving you more pressure than you want.</p><p>I would try some other brand of plain vanilla load, like Fed GM Match, or Rem or Win hunting ammo if you have some lying around.</p><p></p><p>.</p></blockquote><p></p>
[QUOTE="CatShooter, post: 163125, member: 7"] Contrary to some of the "guesses"... it is clearly NOT an oversized pin hole. With an oversized firing pin hole, you get cratering with rounded edges on the outside of the crater, even on light loads. There is no (as in ZERO) cratering on the case that did not perforate... there is nothing wrong with the firing pin hole. The pin to hole fit is fine. Both primers look flatter than that usually seen with factory ammo, that might be the first clue. Keep in mind that S&B, and other European ammo makers, load to a higher standard (CIP), instead of the US standard (SAAMI). There is 5 to 10 Kpsia difference. Not dangerous, but it does add to the pot The flattening could be due to a maximum chamber and minimum case, as a flattened outside primer edge is common with Max chamber and Min case. But when primers perforate like that, it is because the pressure was so high, that it pushed the pin WAY back into the bolt, far enough so that the plug from the primer was inside the bolt... that is HIGH PRESSURE. This type of perforation can happen if the firing pin spring is weak. (I had this happen a few weeks ago in a Rem 40XBBR, and replaced the spring, and the problem stopped. It was 33 years old... ). But if you have no reason to suspect the spring, and considering that the primers are flattened, I would suspect that the S&B ammo is giving you more pressure than you want. I would try some other brand of plain vanilla load, like Fed GM Match, or Rem or Win hunting ammo if you have some lying around. . [/QUOTE]
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