I have 2 old Ithaca Deerslayers, one in 12 and 1 in 20 gauge. Around here Ithaca was / is the gun to buy for slugs. They used a specially bored barrel just for slugs and my 12 gauge will shoot some slugs into 3 inches, more or less. the 20 is somewhat more accurate for me. It really depends on the gun, sights and loads. I experiment with the loads, installed a 1.5 to 5 X scope on mine and it performs well. The most important single item is going to be the sights. a bead just ain't gonna do it. Even the cheapest of sights are better than just a bead for sighting. I also have an Ithaca Deerslayer II with a rifled barrel and it will give me cloverleafs most of the time at 100 yds.