Whose shell holder are you using? You might try a Redding shell holder if you don't already have one. I've had Redding dies that were on the long side and didn't bump the shoulder back as much as it should. Keep in mind Redding makes the shell holder set that allows different sizing depths when using their dies. You would think it would be universal with SAMMI specs but you can still run into problems. I've taken shell holders and lapped material off the top to allow the FL seat die to move the shoulder back a couple of thousandths and that allowed for reliable chambering. I've also lapped the bottom of the die with the same results.
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Gun Control is hitting what you aim at.
I'm in favor of it. :D
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