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Rifles, Reloading, Optics, Equipment
Reloading
Cooper rifle won't chamber twice fired brass
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<blockquote data-quote="Wild_Bill" data-source="post: 1866533" data-attributes="member: 4785"><p>Guys please read the thread before replying.</p><p>There are so many dangerous answers.</p><p>The Op is trimming cases, he has sized and bumped the shoulders back, so shortening die or shell holder will create excessive headspace.</p><p></p><p>When setting up the die with a fireformed case just size the case so it is .002" shorter headspace measurement than fired cases. Don't go back to factory specs you might be fracturing the base of the case by overriding. We see a lot of problems where dies are jammed into shell holders crushing the cases to far and forcing the case head to expand.</p><p>Cooper rifles have tight match chambers.</p><p>Take a new case fire it then carefully size it starting with the die off the shell holder until it slowly comes to .002" shorter than fired. Then reload and fire again. If that does not work the small base die will fix the problem but don't start with the die touching the shell holder. It is very rare that shall holders or dies need shortening however sometimes it's required. The Redding comp shell holders actually reduce the amount sized then don't let you size more.</p></blockquote><p></p>
[QUOTE="Wild_Bill, post: 1866533, member: 4785"] Guys please read the thread before replying. There are so many dangerous answers. The Op is trimming cases, he has sized and bumped the shoulders back, so shortening die or shell holder will create excessive headspace. When setting up the die with a fireformed case just size the case so it is .002" shorter headspace measurement than fired cases. Don't go back to factory specs you might be fracturing the base of the case by overriding. We see a lot of problems where dies are jammed into shell holders crushing the cases to far and forcing the case head to expand. Cooper rifles have tight match chambers. Take a new case fire it then carefully size it starting with the die off the shell holder until it slowly comes to .002" shorter than fired. Then reload and fire again. If that does not work the small base die will fix the problem but don't start with the die touching the shell holder. It is very rare that shall holders or dies need shortening however sometimes it's required. The Redding comp shell holders actually reduce the amount sized then don't let you size more. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Cooper rifle won't chamber twice fired brass
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