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Rifles, Reloading, Optics, Equipment
Reloading
Cooper rifle won't chamber twice fired brass
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<blockquote data-quote="LaHunter" data-source="post: 1865420" data-attributes="member: 54963"><p>My opinion (and I am no expert) is this:</p><p>1) do you have your die set up so that you are making solid (not excessive) contact with your shell holder to the die so that you get some cam over at the top of your up stroke? If not, you should be to get the full effect of FL sizing. </p><p>2) It usually take a few firing for the brass to 'grow' to the full dimensions of your chamber, it appears that it takes 2 firings for your rifle. If you are getting full contact with your shell holder/die on the top of the ram travel and getting cam over, and still not sizing your brass enough, you may need to look at getting a shell holder with a shorter rim or another die, which will allow more sizing. Or you may want to get your chamber checked out by a gunsmith to verify the sizing is within SAAMI specs</p><p>3) Are you trimming your necks? As you size your brass, the lengths grows, so your brass over all length could be too long and the necks could be bumping into the end of your chamber. Assuming you are FL sizing properly, this may be the most likely scenario.</p><p>4) I would recommend getting a Hornaday LnL comparator (or something similar) so that you can measure your new vs fired brass to know for certain the amount of shoulder push back you are getting. This is a valuable tool for precision reloading. You mentioned that you have measured your brass, how did you go about this and what did you see?</p><p></p><p>hope this helps.</p></blockquote><p></p>
[QUOTE="LaHunter, post: 1865420, member: 54963"] My opinion (and I am no expert) is this: 1) do you have your die set up so that you are making solid (not excessive) contact with your shell holder to the die so that you get some cam over at the top of your up stroke? If not, you should be to get the full effect of FL sizing. 2) It usually take a few firing for the brass to 'grow' to the full dimensions of your chamber, it appears that it takes 2 firings for your rifle. If you are getting full contact with your shell holder/die on the top of the ram travel and getting cam over, and still not sizing your brass enough, you may need to look at getting a shell holder with a shorter rim or another die, which will allow more sizing. Or you may want to get your chamber checked out by a gunsmith to verify the sizing is within SAAMI specs 3) Are you trimming your necks? As you size your brass, the lengths grows, so your brass over all length could be too long and the necks could be bumping into the end of your chamber. Assuming you are FL sizing properly, this may be the most likely scenario. 4) I would recommend getting a Hornaday LnL comparator (or something similar) so that you can measure your new vs fired brass to know for certain the amount of shoulder push back you are getting. This is a valuable tool for precision reloading. You mentioned that you have measured your brass, how did you go about this and what did you see? hope this helps. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Cooper rifle won't chamber twice fired brass
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