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Old October 18, 2018, 11:26 AM   #10
mikld
Senior Member
 
Join Date: February 7, 2009
Location: Southern Oregon!
Posts: 2,749
Lifelong machinist/mechanic here. The first time I encountered a primer pocket crimp I immediately thought of a countersink. That was over 25 years ago and have done thousands with zero problems; never removed "too much" metal. A 1/2" 60 degree countersink is easy to find in any decent hardware store. Can be done by hand or chucked in a drill (hand drill or drill press). Quick, easy, inexpensive.
https://www.mcmaster.com/countersinks
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