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Re: A few comments on primers for BPC rifles

Posted by Wayne McLerran on Tuesday, 19 May 2009, at 1:15 p.m., in response to A few comments on primers for BPC rifles, posted by Wayne McLerran on Tuesday, 19 May 2009, at 12:47 p.m.

OK, I just read my previous posting and realized I do know a little more that I can pass along, plus even make a recommendation or two for Trapdoor shooters.

Experience reloaders know that the thickness or profile of pistol primers is a little smaller or lower than rifle primers. Therefore, using large pistol primers in rifle cases can lead to two problems: 1) if not fully seated the primer may move forward under firing pin impact, significantly reducing the impact and leading to unreliable ignite, 2) if the large pistol primer is fully seated it will move back and impact the face of the breechblock around the firing pin upon powder ignition.

With modern day hardened breechblock, primer preening is generally not a problem. But with older firearms this may damage the face of the breechblock. Not knowing how hard the trapdoor breechblock faces are, you trapdoor shooters may be well advised to stay away from large pistol primers and go with the mildest large rifle primer you can find. For maximum accuracy I would suggest staying away from magnum rifle primers.

Regards, Wayne


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