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Old October 10, 2013, 06:58 PM   #6
Bart B.
Senior Member
Join Date: February 15, 2009
Posts: 6,318
Firing pins cause donuts on the outside of the case shoulder/neck junction because that's smaller in diameter than the same junction in the chamber. Especially when the chamber shoulder angle is greater than the case shoulder angle.
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Former US Navy & Palma Rifle Team Member
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