I believe Eleanor O'Connor did her "one-shot safari" (17 animals with 19 shots) with the 160 Speer Hot-Core at 2650 or so from a 7x57.
Yup! if memory serves correctly......
I always liked Speer Hot Cores.
I can't imagine a bull elk walking away from a 250-375 Gameking,either.They sure do make the debris fly from the 400 yard line