I have a .54 side lock cva carbine with a 1:32 twist. Trick for shooting prb through it was back the pyrodex way down. 70 grains of pyrodex will tear the patch to shreds in a tight twist. 40 grains will keep the patch intacked, deliver great groups and drive holes through both sides of a deer's chest at 80 yards. drt. Killed plenty of ks deer with that load as well as with conicals and 80 grains of pyrodex.
