I have shot a lot of targets that showed that hole, and the hole didn't line up with the back of the paper. I have a tendency to use b size sheets of colored construction paper. Fold in middle, electrical tape x on it. just made a new target where the holes don't line up in the paper.

cant really believe a cast 170 slug will be able to hit a piece of paper at 100 yards, and then somehow physically move so that the other matching hole is 2 inches away

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also I have had GAS CHECKS make similar looking holes in target paper. kind of funny too.