my buddy that hunts with me in my home state uses a marlin model 512 bolt action slug gun. he has a trashco fixed 2.5 and uses brenneke gold slugs. he gets decent groups out to 100yds.
i used a smooth bore rifle with a scope on my former 870 wingmaster and i only got decent groups out to 75yds. not bad range especially since in my state they don't get longer than 50yds.