Most PH's don't care for sub 30 caliber rifles. I'm no exception to that. There are more lost game animals when wounded with sub 30 caliber then with over 30 caliber. Nobody with a few years of experience seeing 1000 animals shot and run off will deny the advantage of a better blood trail which comes from larger diameter bullets. Heck anything will kill big game with good placement, but the more important set of requirements is finding the game after it's shot. Also not taking a day of searching which takes away from hunting other animals.
So for my money I want a 30 caliber or larger if it's my hunt. I have had plenty of hunters with sub 30 calibers be successful, and several with big bores that were not. When nerves play into the shooting less then perfect shots make the bigger bores far more attractive to me. For a marksman with ice in his veins then any rifle will probably work. It's up the the hunter to be honest with himself and say...........I will be nervous and excited, or I'm soooo good I will be cool as Ice and not have a problem with anything that comes up. ................... (yeah right)
The 375HH is plenty for everything with the proper ammo selection. No need to buy a rifle just for the trip though. In my camp I have custom rifles for the hunters to use. As far as the dream just to put a few "dreams" into perspective:
Simple 5 animal plains game hunt with 3-4 days in the Kruger park and airfare for 2 about 10,000 (ballpark)
Buffalo 2,500- 4,500 plus
Leopard 5,000 to 8,000 plus
Croc, 6,000 to
Daily fee's 850-1250 plus per day with a minimum amount of paid hunting days
These are ballpark numbers but you can see Africa is an incredibly affordable destination for simple park tours and plains game.
On the other hand it's an elite destination for the wealthy for several species.