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Old December 24, 2011, 11:33 PM   #6
James K
Join Date: March 17, 1999
Posts: 24,136
Chamfering is usually used when the ammo has a sharp corner, like handloaded wadcutters, a Keith type SWC, or jacketed auto pistol rounds like .40 S&W where the mouth of the case tends to hang up on the edge of the chamber. For normal crimped revolver rounds it doesn't hurt, but serves no real purpose.

Jim K
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