I used 58.5 grains of H4831, CCI 250 primer and either the 150 grain Speer hot-cor or the Nosler partition. My 20 inch barreled rifle gave 2850 fps and very good accuracy. I'd work up from 56 grains though as my rifle has a long throat. This rifle took several elk and loads of Mule deer. I never could tell which bullet was better so used the Speer bullet mostly.