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Rifles, Reloading, Optics, Equipment
Reloading
Help on shoulder bump for 7MM Rem Mag
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<blockquote data-quote="woods" data-source="post: 225561" data-attributes="member: 6042"><p>You want to let your brass grow unitl it has a slight crush fit before bumping the shoulder back. The actual measurement that you will push it back to is individual to your rifle chamber so someone else's measurement may or may not be applicable.</p><p></p><p>To check for crush fit just chamber a fired unsized case and compare the amount of force it takes to close the bolt as opposed to the amount of force to close the bolt on an empty chamber. To chamber a case in a controlled round feed rifle you remove the magazine and insert the case from the bottom up into the bolt face. Until you have developed a crush fit you need to neck size only or partial neck size if you only have a full length die. Once you develop a slight crush fit then you can push the shoulder back .001" to try and preserve contact at the shoulder without the crush fit.</p><p></p><p>Out of curiosity, what is the measurement on the shoulder of new unfired cases and what kind of brass?</p></blockquote><p></p>
[QUOTE="woods, post: 225561, member: 6042"] You want to let your brass grow unitl it has a slight crush fit before bumping the shoulder back. The actual measurement that you will push it back to is individual to your rifle chamber so someone else's measurement may or may not be applicable. To check for crush fit just chamber a fired unsized case and compare the amount of force it takes to close the bolt as opposed to the amount of force to close the bolt on an empty chamber. To chamber a case in a controlled round feed rifle you remove the magazine and insert the case from the bottom up into the bolt face. Until you have developed a crush fit you need to neck size only or partial neck size if you only have a full length die. Once you develop a slight crush fit then you can push the shoulder back .001" to try and preserve contact at the shoulder without the crush fit. Out of curiosity, what is the measurement on the shoulder of new unfired cases and what kind of brass? [/QUOTE]
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Help on shoulder bump for 7MM Rem Mag
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