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I really don't know whether the copper would last in a pistol or not, but at normal pistol velocities and firing rates, it would make little difference, since the amount of additional wear of soft steel over gilding metal would not amount to much over the normal barrel life of the pistol or in the normal firing of a handgun. How often does even an avid pistol shooter fire magazine after magazine until the barrel turns red hot?
The video was useful in a discussion of rapid and extended fire. IMHO, it would have almost no relevance to handgun use, or be a major concern in choice of ammunition.
Jim
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