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Long Range Hunting & Shooting
What blew up my gun?
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<blockquote data-quote="MNbogboy" data-source="post: 1710332" data-attributes="member: 18849"><p>As K1W1Spada mentioned in his post there may have been previous damage.</p><p>Having spent 20 years in heavy equipment failure repair and the next 30 in mechanical engineering including more failure analysis. Often photos were used showing obvious clues (ie; staining, crystalline abrasions etc). In this case the heavy soot may be hiding something or deceiving as to making any conclusive answer.</p><p>The photos do show that the sides of the bolt nose & extractor were blown completely off with the bolt in battery when the case ruptured. The brass that impaled itself inside of the receiver shows it was in correct position at the moment of impact.</p><p>My thought is that at that moment the receiver split allowing violent upward thrust of the bolt. (Imagine shooting the inside of the receiver at point blank with a steel & brass projectile at 22-250 velocities [or more].)</p><p>It would be interesting to enter all scenarios into a FEA program. If I wasn't retired I could do that but don't have the program and a computer big enough to run them anyway. It could show a step by step failure starting with the case head/web at xxx pressure.</p><p>The case and part of its rim left in the barrel also corresponds with the parts of the bolt nose left intact. Another reason why I believe the brass failure first preceded the rifle damage.</p><p>Imho,</p><p>Randy</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 1710332, member: 18849"] As K1W1Spada mentioned in his post there may have been previous damage. Having spent 20 years in heavy equipment failure repair and the next 30 in mechanical engineering including more failure analysis. Often photos were used showing obvious clues (ie; staining, crystalline abrasions etc). In this case the heavy soot may be hiding something or deceiving as to making any conclusive answer. The photos do show that the sides of the bolt nose & extractor were blown completely off with the bolt in battery when the case ruptured. The brass that impaled itself inside of the receiver shows it was in correct position at the moment of impact. My thought is that at that moment the receiver split allowing violent upward thrust of the bolt. (Imagine shooting the inside of the receiver at point blank with a steel & brass projectile at 22-250 velocities [or more].) It would be interesting to enter all scenarios into a FEA program. If I wasn't retired I could do that but don't have the program and a computer big enough to run them anyway. It could show a step by step failure starting with the case head/web at xxx pressure. The case and part of its rim left in the barrel also corresponds with the parts of the bolt nose left intact. Another reason why I believe the brass failure first preceded the rifle damage. Imho, Randy [/QUOTE]
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What blew up my gun?
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