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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Defiance AnTi question
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<blockquote data-quote="jensenj71" data-source="post: 2746941" data-attributes="member: 96797"><p>Just to be clear, I was seeing other signs of pressure at 2900fps with harder brass, but I wasn't getting a heavy bolt lift or heavy bolt closing on fired brass. Primers were getting flatter and the dimple from the firing pin was starting to crater. I had noticed the faint ejector marks, but failed to realized they were actually raised bumps. I knew from other folks that I should see pressure by 2900fps. I was just surprised that the brass was extruding into the ejector given the other signs of pressure seemed moderate. Generally, I have found loss of primer pockets, heavy bolt lift and extruding brass seems to show up after ignoring the initial signs of pressure. I don't usually go past the initial signs unless I am chasing a node up into pressure and I just want to find the high side of the node.</p><p></p><p>All in all, the pressure didn't stick the case in the chamber, rather the case was just too long when including the raised bump. Agreed, still over pressure for that particular brass and perhaps even over design pressure. I was relaying my experience as a reason for heavy bolt lift and a heavy bolt close on fired brass. I could resize and bump the sholder back 0.002 and still get a noticeable rub on bolt close. It was while measuring the shoulder bump that I noticed I was getting inconsistent readings depending on how the raised ejector bump lined up with the calipers.</p></blockquote><p></p>
[QUOTE="jensenj71, post: 2746941, member: 96797"] Just to be clear, I was seeing other signs of pressure at 2900fps with harder brass, but I wasn't getting a heavy bolt lift or heavy bolt closing on fired brass. Primers were getting flatter and the dimple from the firing pin was starting to crater. I had noticed the faint ejector marks, but failed to realized they were actually raised bumps. I knew from other folks that I should see pressure by 2900fps. I was just surprised that the brass was extruding into the ejector given the other signs of pressure seemed moderate. Generally, I have found loss of primer pockets, heavy bolt lift and extruding brass seems to show up after ignoring the initial signs of pressure. I don't usually go past the initial signs unless I am chasing a node up into pressure and I just want to find the high side of the node. All in all, the pressure didn't stick the case in the chamber, rather the case was just too long when including the raised bump. Agreed, still over pressure for that particular brass and perhaps even over design pressure. I was relaying my experience as a reason for heavy bolt lift and a heavy bolt close on fired brass. I could resize and bump the sholder back 0.002 and still get a noticeable rub on bolt close. It was while measuring the shoulder bump that I noticed I was getting inconsistent readings depending on how the raised ejector bump lined up with the calipers. [/QUOTE]
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