I wonder how small the percentage is of those rifles chambered in hard kicking-hard killing 'African' cartridges actually ever get used in Africa (or any other place where there's heavy dangerous game). I think it's mainly the mystique, or a macho thing, that drives the majority of purchases of said guns.
I suppose that if I were standing nose to nose with a riled up Cape Buffalo or a wild-eyed rogue elephant, nothing I held in my hand would seem powerful enough. But, sadly, that is beyond my purview. Perhaps Walter Mitty-ish dreams are sufficient reason to arm myself thusly!