I'm confused, you have advice and an opinion on everything, but from reading your inputs, you haven't killed anything larger than a buff in Africa. Possibly you should leave the advice to those of us who have ACTUALLY killed the big five. I'm sorry, but you have never faced an enraged elephant at 18 mtrs. You have never played footsy around a tree at 2 mtrs with a rhino, and apparently you've never had a leopard try and climb in the blind with you etc, etc, etc. Possibly you should bow out and read and learn from those of us who have ACTUALLY done it.
When I recommend a caliber, I have actually hunted and killed game with it, probably the game the op has asked about. Apparently not you.
But you know what, it pi**es me off to no end, when some wet behind the ears whelp, counters my advice that is given with years of experience.
Just a thought, but maybe you should read more and opine less !!!
Apparently you own a double, whoop de doo so do I. That in and of itself does not make you an authority on doubles or African hunting of big game.
Douglas