Most rifled slug manufacturers say they can be fired through anything up to a full choke, but the reccommended is usually no tighter than modified, depending on the brand. The main issue most people say when talking about slugs and shotgun barrels is that barrels with screw-in chokes usually have thinner walls at the muzzle and may not handle the pressure from a slug through, say, sa full choke. Since these are fixed chokes that may or may not be a problem. Best way to find out is to test performance with different brands. One thing for sure is the recoild will be heafty. I can say for certain from having put a box of slugs through my dominion arms single barrel backpacker.