I shoot a mossberg 500 with fully rifled barrel(cantilever) with a Cabelas 2-7x scope. I tried just about every slug recommended for a rifled barrel and mine likes Remington ultra-corelokt's the best. 1" groups at 50 yrds. and 2.5 inch groups at 150 yards. Definitely have to try them all to see which is best. Hard on the pocket book and the shoulder but worth it when that bruiser steps out at 150 paces!