I've got a Jim Chambers pennsylvania fowler in 20 bore. Great gun, and I've used it mostly as a shotgun. I have played with patched ball, and can get groups of 4 to 5 inches at 50 yards. Good enough, but not great. PRB is over 80 grains of GO FFg. Only taken one shot at a whitetail with it, I overshot her at about 30 yards. Killed another 15 minutes later at 45 yards with a .54 Harper's ferry I had with me as well.