One thing to look out for is how you are shooting the gun from the bench. Full stocked guns can sometimes be touchy on where you rest the forearm. Some prefer towards the muzzle, and some over one of the middle barrel pinnings. As all of my hunting is done from "off hand" and not a bench, I usually hold the forearm with my hand with my elbow on the bench and the gun to my shoulder and not on bags. I have had guns that shot good groups from the bench with the gun rested and in bags, that would shoot to a totally different point of aim when shot off hand. Moving your target closer until you find your best load is good advice. .