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Bart B. · October 10, 2013, 06:58 PM

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.

October 10, 2013, 06:58 PM	#6
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	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.