The .470 NE I had spit out 500 gr. bullets at about 2125 fps. That round was field proven for several decades before the 458 WM or Lott were wet dreams.

You can kill any buff that ever walked with a 375, so a 458 going around 2100 fps is more than enough, for buff. Maybe not the best, but good enough.

Using a good bullet is probably more important.