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Message: <blockquote data-quote="Shadowrider" data-source="post: 3388368" data-attributes="member: 3099"><p>I've slept many times since I was reading about this, but I think it goes to USPSA open guns. Some builders used to and maybe still do recommend rifle primers in hot overloaded .38 Super to make major PF. They they are a thicker cup material or a harder cup material or maybe both depending on brand. If you back off the pressure they won't seal and you get erosion like this. It doesn't take many rounds to get the damage you see here either. The burning gasses under the pressures generated while the bullet is still in the barrel and traveling down it are at almost plasma temps, at least that's the theory I seem to remember. A few rounds with leaky primers will do considerable damage. I suspect people just took for granted that you can interchange them and you see what can happen.</p></blockquote><p></p>