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Rifles, Reloading, Optics, Equipment
Reloading
Pressure signs on straight wall cases?
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<blockquote data-quote="Pdvdh" data-source="post: 1371835" data-attributes="member: 4191"><p>You must have a digital caliper. I use a dial caliper, so it's quite simple to identify +/- 0.0002" expansion. I wouldn't purchase a 0.0001" caliper or micrometer, or let that stop me from monitoring case head expansion. Monitoring for 0.0005" will still be helpful, as when you see that, you'll be confirming the other pressure signs you should already be experiencing.</p><p>In my experiences, you aren't in the more dangerous pressures where cases start to leak gas out the case head or primer until case heads expand well past 0.001". Maybe even more than 0.002". I don't have lots of experiences past 0.002", but the one's I've had it usually just meant the primer pockets expanded so much that the casing might need to be retired to the trash bin.</p><p>It's best to do this with the first firing of the cases. You can monitor expansion on later firings, of course, but the pressure/expansion relationship changes with additional firings, because the brass case head toughens up (work hardens) with each additional expansion/firing.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1371835, member: 4191"] You must have a digital caliper. I use a dial caliper, so it’s quite simple to identify +/- 0.0002” expansion. I wouldn’t purchase a 0.0001” caliper or micrometer, or let that stop me from monitoring case head expansion. Monitoring for 0.0005” will still be helpful, as when you see that, you’ll be confirming the other pressure signs you should already be experiencing. In my experiences, you aren’t in the more dangerous pressures where cases start to leak gas out the case head or primer until case heads expand well past 0.001”. Maybe even more than 0.002”. I don’t have lots of experiences past 0.002”, but the one’s I’ve had it usually just meant the primer pockets expanded so much that the casing might need to be retired to the trash bin. It’s best to do this with the first firing of the cases. You can monitor expansion on later firings, of course, but the pressure/expansion relationship changes with additional firings, because the brass case head toughens up (work hardens) with each additional expansion/firing. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Pressure signs on straight wall cases?
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