RE: Slugs
If you shoot a smooth bore barrel - Brenneke rifled slugs... 4- 5 inch groups with iron sights at 100 yards work well out of my Mossberg 3000 pump.
If you shoot a rifled Barrel - Lightfields for supremeaccuracy out to 100+ - Or Federal Barnes, Winchester, Hornady SST's will get you out past the 150 yard mark.