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Old December 9, 2012, 12:21 AM   #7
the led farmer
Senior Member
Join Date: July 8, 2012
Location: so cal
Posts: 246
Check to make sure you didn't buckle the shoulder. You can tell by a mushroom shape at the shoulder. It's caused by having the seating/crimp die set improperly that causes the crimp ring to be too deep. As you seat the bullet and/or crimp the case is jammed into the crimp ring, the weakest poimt gives causing the shoulder to buckle.

Like so: not so bad on top to downright ugly on the bottom

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