I believe Carmichel used the Sierra 250 gr BT Game King. I remember an Outdoor Life article that he killed a big Cape Buffalo and a big bull elk with 2 shells loaded with 68 gr IMR 4350 and that bullet. I think the elk was pretty long range too. I looked last night and couldn't find the article. I always enjoyed reading his stuff.
That must have been with the .338 WM. The .338-06 won't hold that amount, in fact 58 grains is a compressed load.
