I think it is important to clarify just how far you would like to be able to or expect to be ablemake shots. Most slug hunters nowadays (not all) if regularly slug hunting, are using a rifled barrel with a scope.

I have my dedicated slug gun which can shoot over 100 yards very, very well. Of course it is rifled barrel and scoped. I also have a smooth-bore/rifled open sight pump shotgun I use when in tight brush/woods. It is good to 75yrd +/-.