There will be quite a few inch drop from 50-100 yards so If your going to shoot 100 yards, make sure you get plenty of practice at both 50 and 100 yards. Smoothbores can drop 6-12 inches at 100 yards. Otherwise, often times it's trial and error with shotguns. You have to find the right slug that will shoot good from your gun. And for a smoothbore, yes you want a rifled slug and NOT a sabot. It will say "Rifled Slug" on the box.