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Rifles, Reloading, Optics, Equipment
Reloading
Excessive case expansion question
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<blockquote data-quote="Mikecr" data-source="post: 2415142" data-attributes="member: 1521"><p>When you bump back 0.001, is that from a point of actual zero headspace?</p><p>You shouldn't bump until fire formed to reach zero headspace, which you would bump from.</p><p></p><p>Forget SAAMI brass spec, it's not YOUR brass spec. </p><p>What does your new/unfired brass measure above extractor groove?</p><p>If that measure is growing so much as described, it is excessive chamber clearance. I would suggest to the point of being unsafe, as the web area is not gripping the chamber, allowing the brass to stretch back and cause high bolt thrust (as well as your case separations).</p><p></p><p>Yeah, you can set back the barrel maybe an inch and re-cut the chamber with a better reamer, and better gunsmith.</p><p>It should not cost a lot to have that done.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2415142, member: 1521"] When you bump back 0.001, is that from a point of actual zero headspace? You shouldn't bump until fire formed to reach zero headspace, which you would bump from. Forget SAAMI brass spec, it's not YOUR brass spec. What does your new/unfired brass measure above extractor groove? If that measure is growing so much as described, it is excessive chamber clearance. I would suggest to the point of being unsafe, as the web area is not gripping the chamber, allowing the brass to stretch back and cause high bolt thrust (as well as your case separations). Yeah, you can set back the barrel maybe an inch and re-cut the chamber with a better reamer, and better gunsmith. It should not cost a lot to have that done. [/QUOTE]
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Excessive case expansion question
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