' 69,
Sounds like a honest and unpretentious request. You are at an exciting junction. You' re talking some heavy duty adventure and that in turn attracts a heavy duty crowd. You' re looking at some $$$ and some trade offs to be weighed in your quest for dangerous game.
Try
http://www.accuratereloading.com.
Go onto the African game forum. The hunting trip brokers cruise those waters and can fill you in on dangerous game hunts all over the world (Atkinson, an old sage, is one). You will need a grip on three items: money, time, and mental toughness. Come on plain and honest and they will give you a load of help. A word of caution though, they have no tolerance for BS' ers --- pretenders can get cut to pieces. Just like what can happen in the bush.
Never Go Undergunned,
EKM