I have a Benelli SBE 2 12 gauge with a rifled slug barrel and Leupold Grand slam. It took a while to find the right slug but once I did (Remington ultra core loc) I was MOA at 100 and 200 yards. The big key is after 3 shots I always clean the barrel with a cleaner that removes the plastic residue. If I do that my accuracy remains great - if not it quickly goes down. Last year I did a double lung shot on a buck at 200 yards wth no problem. A dedicated slug gun might get better accuracy but I'm hunting not target shooting