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					Originally Posted by  Larryjk
					 
				 
				Did your friend buy his .264 new?  If it was a used rifle, you cannot know what happened to it before it went back on the market.  If a rifle has been piercing primers, the tip might be "flame cut".  Instead of having a perfectly round profile, it may be more like a "semi'wadcutter" in profile.  That would cause it to continually pierce primers.  The only solution to that is a new firing pin.  It would be wise to remove the firing pin and carefully and inspect the tip for damage. 
			
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Very possible answer to the problem.
If the primers have pierced before there is a good chance the tip of the striker is eroded and causing trouble.