Really usefull load for my new 470. I just finished regulating a 375Gr. hard-cast heat-treated lead bullet load. 77Gr of R15 (with filler) prints a nice 1.7" four shot group 1.5" high dead center at 50 yards. The bullets are from Cast Performace and are quite cheap. They are serious hunting projectiles and have an excellent record on all large game.