Use an "Improved Cylinder" or "Skeet" tube for your gun when shooting slugs. Most guns will shoot slugs quite well with that combination. My pump 12 ga. will shoot Brennecke slugs into 4" at 100 yd. with just an IC tube. But I'm talking about the old "rifled" slugs. Your gun probably won't shoot the new saboted slugs that you're referring to, well. They're designed to be shot through a rifled barrel. If you want use those, it's best to just get a rifled slug barrel.