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Rifles, Reloading, Optics, Equipment
Gunsmithing
Case Seperation I thought.
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<blockquote data-quote="JeffVN" data-source="post: 1618346" data-attributes="member: 2261"><p>Glad you are all right. </p><p></p><p>Unless this was your first shot of the day prior loads and brass should have provided a hint that this might be coming. If you look at the load prior to this one, I'll be you have ejector marks and possibly signs of smear on the bottom of the brass. possibly some tight bolt and likely a flattened and/or cratered primer. </p><p></p><p>Assuming you still have a piece or two of un-fired brass from the same lot, measure the extractor groove with a blade micrometer (or decent caliper if the front is thin enough to fit into the groove). Go back to your prior loads, the ones that don't appear to be way over pressure, and measure the extractor groove of each one. A primer pocket growing is a sign you are nearing the pressure limits of that brass. If the pockets in my brass grows more than a thou 0.001 per firing I know the brass will last roughly 4-5 shots before the pockets are approaching too loose to hold a primer (time to either glue in the primers or recycle the brass). You can work harder the brass to take higher pressures and loads by fire forming at lower pressures, but that is a discussion for a different thread.</p><p></p><p>Been there did that with my 375/416 Barrett, dam glad to not be injured.</p></blockquote><p></p>
[QUOTE="JeffVN, post: 1618346, member: 2261"] Glad you are all right. Unless this was your first shot of the day prior loads and brass should have provided a hint that this might be coming. If you look at the load prior to this one, I'll be you have ejector marks and possibly signs of smear on the bottom of the brass. possibly some tight bolt and likely a flattened and/or cratered primer. Assuming you still have a piece or two of un-fired brass from the same lot, measure the extractor groove with a blade micrometer (or decent caliper if the front is thin enough to fit into the groove). Go back to your prior loads, the ones that don't appear to be way over pressure, and measure the extractor groove of each one. A primer pocket growing is a sign you are nearing the pressure limits of that brass. If the pockets in my brass grows more than a thou 0.001 per firing I know the brass will last roughly 4-5 shots before the pockets are approaching too loose to hold a primer (time to either glue in the primers or recycle the brass). You can work harder the brass to take higher pressures and loads by fire forming at lower pressures, but that is a discussion for a different thread. Been there did that with my 375/416 Barrett, dam glad to not be injured. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Case Seperation I thought.
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