Quak,
SORRY but you are DEAD WRONG.
I load shoot 9.3x62mm for myself. Further .375 Whelen & .400 Brown-Whelen Improved are easily made from .30-06 cases & all THREE are BETTER than the 6.5 or even the 7mm. = The .400B-WI is fully as powerful as the .404 Jeffery for BIG/TOUGH/DANGEROUS game.
That said, neither the .30-06 nor the 8x57 have any flies on them. = In fact the .30-06 loaded with a 250 grain bullet is in the same power range as the .318 Westley-Richards, which is well-regarded in Africa.
yours, tex
The 9.3x62mm was liked by Chub Eastman. I loaded for it 13 years ago. It's a heck of a round.
