in my experience and through conversations with mossberg, shooting a rifled slug through a rifled barrel isn't what you want to do. the lead in the slug is so soft it pushes through the barrel filling the groves with lead. if you are shooting a fully rifled barrel, for the best accuracy and consistency, you must shoot sabots. i used winchester gold tips in 2 3/4" and use a mossberg 835 with a fully rifled barrel and a bushnell scope and would not hesitate on a 125 yd shot with a good rest. it took me a while to find the ammo that seems to "fit" my gun, different brands, grains, etc. good luck, it can be frustrating but once you find the combo you'll be good to go!