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Rifles, Reloading, Optics, Equipment
Reloading
Case head separation?
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<blockquote data-quote="engineer40" data-source="post: 1272040" data-attributes="member: 90399"><p>A first for me... I had a case come out of the chamber in 2 pieces the other day, separated at the case head. </p><p></p><p>The case was on it's 4th firing. </p><p></p><p>Since I was loading right towards the top of the load data, I had been checking for pressure signs every firing. I saw none. Primers always looked good. Nothing funny looking on the case head. Cases always extracted easily. Primer pockets weren't loose at all. </p><p></p><p>I shot 20 rounds that day loaded identical. Only had that 1 case come apart. </p><p></p><p>This is a newer rifle for me. I'm trying to think through what could have caused this if I wasn't seeing pressure signs. Is there a chance that my chamber is too large or the sizing die is too small? It is a factory barrel. When I measure fired cases just above where the 1 case had the head separation, they measure at 0.479. When I measure a case that I've already sized they measure 0.473. Is 0.006 too much to squeeze brass back down? </p><p></p><p>This is a straight walled magnum cartridge. There is no shoulder to measure. But when I full length size standard rifle cases, I usually only bump the shoulder back around 0.002 to 0.003. </p><p></p><p>Any of you guys experience case head separation when you weren't seeing pressure signs? Obviously this makes me a little nervous to reload ANY of the cases again. Thanks!</p></blockquote><p></p>
[QUOTE="engineer40, post: 1272040, member: 90399"] A first for me... I had a case come out of the chamber in 2 pieces the other day, separated at the case head. The case was on it's 4th firing. Since I was loading right towards the top of the load data, I had been checking for pressure signs every firing. I saw none. Primers always looked good. Nothing funny looking on the case head. Cases always extracted easily. Primer pockets weren't loose at all. I shot 20 rounds that day loaded identical. Only had that 1 case come apart. This is a newer rifle for me. I'm trying to think through what could have caused this if I wasn't seeing pressure signs. Is there a chance that my chamber is too large or the sizing die is too small? It is a factory barrel. When I measure fired cases just above where the 1 case had the head separation, they measure at 0.479. When I measure a case that I've already sized they measure 0.473. Is 0.006 too much to squeeze brass back down? This is a straight walled magnum cartridge. There is no shoulder to measure. But when I full length size standard rifle cases, I usually only bump the shoulder back around 0.002 to 0.003. Any of you guys experience case head separation when you weren't seeing pressure signs? Obviously this makes me a little nervous to reload ANY of the cases again. Thanks! [/QUOTE]
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Reloading
Case head separation?
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