RE: question
You can shoot slugs or shot through a smooth bore. If you shoot shot through a rifled barrel the shot will foul the rifleing badly and have a negative effect on your slug accuracy. I can't even guess what the rifled bbl would do to your shot pattern. Unless you are dead set on a rifled bbl I would just shoot slugs through the bbl that came with your shotgun. Use the foster type. They are much cheaper and should do the job very well out to 75 yards. Good luck.