500 grains, in line with your reasoning, I take it the early pioneering hunters (Selous, Oswell, Cornwallis Harris etc..) were wrong to go out into the wilds of Africa with their inferior muzzle loaders, and , Heaven help us... without the services of a PH/Babysitter !!
Anyone who wants to take a Buff with a bow and arrow has my admiration and respect. I am sure they do their risk assessment, and know the dangers.
If one wants to really take the danger out of DG hunting , one may as well turn up in an armoured personnel carrier with a well zeroed RPG.
A rather well known PH reckoned that some hunters only used really heavy calibre weapons because they saw them as an extension of their penis, certainly not because they could shoot them !
Seriously though , choice of weapons is very much a personal thing, I certainly would not impose my choice of weapons on any other hunter.

M