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BiMetal bullet jackets!!
When I go to the range, I always like to take a blaster along just to burn ammo and shoot the gongs so I'm not interested in precision accuracy. Since most of these are some form of military (AR platform of .45 auto, etc) semi-auto, and since I don't reload for semi's and hate picking up brass, I've been shooting some of the cheap Russian, steel case bimetal ammo. Yesterday, the range officer pointed out that the bimetal jacket is actually a copper washed steel jacketed lead core that appears to be a full copper jacket. He showed that the bullets are magnetic, and the copper wash is so thin that the rifling cuts into the steel jacket. What is boils down to, if you want to wear out your barrel fast, shoot bimetal!! When I got home I did some research and found this great article. Well, I learned something and I figured I'd pass on the info and give everyone a heads up, if you were not aware of this.