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A few years back, a friend started loading some 45ACP rounds with the bullets backwards for his S&W revolver. I think they were in the 150gr range and were lead SWC's. Not only were they accurate at 50 yards, they cut an absolutely clean hole on the target. They were his favorite Bullseye round for his revolver.
I've heard of backwards .223s being used on bowling pins. Normally, they tend to just sail right through with not a whole lot of impact on the pin.