I would suggest trying several different types of sabot slugs, with a cold barrel. Very important to let your barrel cool, especially with slug barrels. There isn't alot of metal for heat dispertion, and as metal heats it expands. If i shoot a 3 shot group one after another, first shot is good, second a little to the left, and third a little farther to the left. Barrel designs are all different and certain slugs just will not work in them. I have an Ithaca 37 dearslayer in 20 guage and it will not shoot copper solids for anything. They flip, turn and go thru the target sideways. Lightfields on the otherhand will put all 5 shots in the box they came out of at 100 yrds. The remington premier core locket seem to shoot pretty good as well, and seem to be amuch hotter load. More recoil and muzzle flash seen thru the scope. Haven't tried the new hornady SST slugs yet but can't wait to try them. Knowalot of people using them in their blackpowder guns and love them for accuracy and distance. Well have fun to me half the fun is just going out and shooting to fin d out whats best, and lately there are so many new things coming out it's hard to keep up.