I might endorse the BERGER 115 or 150 GRAIN FB TGT bullet. Much less recoil for the little diameter scoring rings at These yardages. Will help a whole lot with your rating. A different great sizing approach when loading for bolt guns is to work with a neck-measurement-only die or https://dominickfscqz.shotblogs.com/308-bullets-reloading-can-be-fun-for-anyone-52828614