Cool!
Years ago, while talking with Elmer Keith, he told me to load the Lyman #462560 (560gr.) with hardened WW's to 1,900fps to 1,950fps and don't worry about a thing in Africa. I was talking to him about cape buff, hippo and elephant. The rifle was a VZ Mauser .458 2".
He told me my load with Barnes Spitzer 400's (.049 jackets) at 2,150fps would be fine for all plains game and the cats.