If the 300blk won’t do it then neither will the 7.62x39. They have nearly identical ballistics. Both are 200yard guns and a little further with the right bullet. That right bullet is much harder to find in x39 because of available options and velocity loss. The Barnes black tip 110gr in 300blk has served me well out to a tad past 260yards. It fully expands down to 1300fps. You won’t get a pass through, though.