With a rifle with a good bore the best bullet you are going to get is the Hornady .312 150 sp . Load it with the whole crimp groove above the neck . That is as long as you can do and keep enough bullet in the case neck to keep it straight . If you have a extra large bore the Hornady .312 174 rn bullet will help , loaded as the 150 . The Hornady .311 174 boattail will be a poor performer no matter how you load it .