Im just learning but I cant find any double 00 buck, so when i bought the gun I went to walmart and got some heavy tgame load 5 shot spread, ther barrel is a straight barrel, its not rifled, i hope those are okay to shoot out of it, i shot one into a 55 gallon plastic drum when i got home, im in city limits but we got good amount of land behind house, so i shot it and came inside quick lol.