I had a friend who used nothing but buckshot in his .32. #1 buck is .305 in diameter so will require a thick patch. #1-1/2 buck is .31 in diameter and could also be considered. You don't have to buy shotshells to dismantle for the shot, look for a reloading supply house and buy a bag of shot. You can shoot a looooooong time with 25 lbs of shot. Be aware that some shot is alloyed, usually with antimony, for more hardness.