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Rifles, Reloading, Optics, Equipment
Reloading
338LM Pressure Signs?
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<blockquote data-quote="bigedp51" data-source="post: 1270868" data-attributes="member: 28965"><p>If the shoulder bump or head clearance is on the long side the further the primer will back out of the primer pocket. When the case is forced back against the bolt face the primer will fold more and flatten at the edges giving a false indication of pressure.</p><p></p><p>Not long ago I was at the range and picking up my LC 5.56 brass and did a double take. I had picked up a 5.56 case that had the primer crimp removed by hand. This case had the primer pocket excessively beveled and looked like it had a large rifle primer in this case.</p><p></p><p>Bottom line, anytime a primer can back out of the primer pocket it will show more signs of primer flattening around its circumference. And over sized firing pin holes or beveled holes in the bolt face can also give a false indication of high pressure.</p></blockquote><p></p>
[QUOTE="bigedp51, post: 1270868, member: 28965"] If the shoulder bump or head clearance is on the long side the further the primer will back out of the primer pocket. When the case is forced back against the bolt face the primer will fold more and flatten at the edges giving a false indication of pressure. Not long ago I was at the range and picking up my LC 5.56 brass and did a double take. I had picked up a 5.56 case that had the primer crimp removed by hand. This case had the primer pocket excessively beveled and looked like it had a large rifle primer in this case. Bottom line, anytime a primer can back out of the primer pocket it will show more signs of primer flattening around its circumference. And over sized firing pin holes or beveled holes in the bolt face can also give a false indication of high pressure. [/QUOTE]
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Reloading
338LM Pressure Signs?
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