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Old August 3, 2011, 11:52 AM   #42
Join Date: March 4, 2005
Location: Ohio
Posts: 11,541
Expansion is needed with cast bullets to stop the brass shaving them hard, but a chamfer is adequate with jacketed bullets, even with square bases. Note that manufacturers don't expand case mouths loading new cases, and sometimes have a little shaved copper at the mouth of the case to prove it.
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