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Rifles, Reloading, Optics, Equipment
Reloading
Pancakes, Craters & Swipes
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<blockquote data-quote="Mikecr" data-source="post: 2923724" data-attributes="member: 1521"><p>Or a sharp edge of the ejector hole in the bolt face.</p><p>The fattening primer due to high head space.</p><p>The slight cratering due to pin hole fit.</p><p>Popping extraction could be present with low breech support or bad bolt timing.</p><p>Purely difficult bolt turn could result from oil in the chamber.</p><p>Pockets could quickly loosen due to weak brass alloy or excess web clearances.</p><p></p><p>Every bit of it could happen at a moderate pressure, depending on the ammo and gun build.</p><p>You really can't estimate pressures without confirmation from a chronograph.</p><p>This is where you see a [pressure sign].</p><p></p><p>What we can see easy enough is [problems brought on with rising pressure].</p><p>And they should be addressed.</p><p>But they're usually below an actual [pressure problem].</p><p></p><p>I could build a gun and ammo to shoot 10Kpsi above SAAMI max, as normal, with no apparent problems.</p><p>All I need for this is to address the list above.</p><p>I would know fairly well that I'm 10Kpsi high thanks to my chronograph and QuickLoad calibrated to the load.</p><p>PressureTrace works even better for this, but you still need the chrono.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2923724, member: 1521"] Or a sharp edge of the ejector hole in the bolt face. The fattening primer due to high head space. The slight cratering due to pin hole fit. Popping extraction could be present with low breech support or bad bolt timing. Purely difficult bolt turn could result from oil in the chamber. Pockets could quickly loosen due to weak brass alloy or excess web clearances. Every bit of it could happen at a moderate pressure, depending on the ammo and gun build. You really can't estimate pressures without confirmation from a chronograph. This is where you see a [pressure sign]. What we can see easy enough is [problems brought on with rising pressure]. And they should be addressed. But they're usually below an actual [pressure problem]. I could build a gun and ammo to shoot 10Kpsi above SAAMI max, as normal, with no apparent problems. All I need for this is to address the list above. I would know fairly well that I'm 10Kpsi high thanks to my chronograph and QuickLoad calibrated to the load. PressureTrace works even better for this, but you still need the chrono. [/QUOTE]
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