Daniel, if your question is “Can I use a rifled barrel to shoot buckshot?”, the answer is, “Yes, but it will cause a very large increase in pattern size.” And, past 12 yards, you would probably miss with more buckshot than you will hit with. The main problem with shooting shot out of a rifled barrel is that the plastic from the shot wads will clog up the rifling in the barrel. Best to use slugs for a slug barrel and shot or buck in the smooth barrel.

Great article that goes i to detail about pattern change between a rifled barrell and
cylinder bore choke
theboxotruth.com/the-box-o-truth-43-buckshot-in-a-rifled-shotgun-barrel/

person asks, “Can I use a rifled barrel to shoot buckshot?”, the answer is, “Yes, but it will cause a very large increase in pattern size.” And, past 12 yards, you would probably miss with more buckshot than you will hit with