If possible find someone who can relay that top rib. Should be a nice gun, and as I stated earlier, a real steal !! I have a nice W&C Scott 12 bore double percussion gun, have taken a lot of duck and rabbits with it. 2 3/4 drams of Fg with an ounce and a 1/4 of no 4. You seem to need to use heavier shot in a muzzle loader than you might do in a cartridge gun. The heavier shot seems to retain velocity for longer and more knock down.