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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