This water pipe was able to put 10 shots into 13" @ 50 yds. Black Powder cannon's bore is .472" firing a .452" ball. The first fixed mount, with sights, split after a few firings. The new mount is holding up well after fixing it with Brownells Acura Glass. Home made cast bullets, shot out of your rifled handgun, should at least be able to do this well shooting from a rest.