I have a 12ga 870 with a one-side mounted 2.5x20 scope. I can get decent groups up to around 75 yards but would like to be more accurate with longer shots, I don't have much faith in a 100 yard shot. I have a fully rifled barrel, but never can be smart enough to find the right sabots(or keep using the same kind). Anyone have recommendations on a better setup or slugs? I also use this gun for hunting other game, so I take the slug barrel off at the end of deer season. I have other guns to use but like the 870 so much. Thanks.