atkinson-
I've never owned or used a 458 Win or hunted in hot climates with any big bore or taken a buff although I do hope to rectify that.
While those here who've used the 458 W with good results have experience that cannot be denied, Terry Wieland's book, DANGEROUS GAME RIFLES, pretty much sums up the 458 W and it's past as you've described. He claims that many loads with a 500-gr bullet barely reached 1900 fps from a "standard length" barrel when it first came out. Obviously, the 458 has improved with more and different powders according to its proponents here.
It's an interesting discussion but why I am having a Lott built instead.
Gdv
If you or Terry Wieland is claiming that a 45 cal.500 grain bullet at 1900 FPS is not effective then I have serious doubts about about anyhting else that is said.......