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When you are sizing your cases, how do you set up your die? If you aren't measuring and just adjusting the die "1/4 turn past when it makes contact with the shell holder" or something like that, you might be setting the shoulder back excessively.
If you have excess head space due to setting the shoulder back too far, it cause primers to flatten even with normal pressure loads. With some powders and lighter loads I get black on the outside of the case neck due to it not sealing tight enough in the chamber.
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