I bought a new BPS with a rifled cantilever barrel for this year. This weekend I'm headed to the range to find out some sabots that it likes and shoots best, and to zero the scope. I put a Nikon 3-9x50 slughunter on it. I was wondering if anyone had some recommendations I should try to save my shoulder some. In the past I've shot Winchester Super-X 2 3/4" out of my old gun, but that's all I ever tried. I have a few boxes left over that I was going to take with. Also would I be better with 2 3/4 or 3"? Thanks