Four years ago I hunted in Africa with two professional hunters "PH" they call them. Two down to earth no nonsense guys.
Here is what I learned. The most used rifles are the 30-06 , the 7x64 and the 223. This ammo is made in Africa and is readily available. One other rifle is the 6mm-303 a standard caliber. They call it the 6mm Musgrave.
They also told me when some one shows up with magnum rifle they say O' O'. Here comes another one that can't shoot.
I got a bit of a dubious reception when I showed up with a 7mm-08AI, and was right away taken out to a range to find out what I could do with this rifle, only to find out that I outshot both of them, not by much.
They brought out their 375 H&H and had me shoot it at 100yards at a 4 inch steel hanging plate, just in case my wee gun was not up yo the job. I said If I hit the gong, do I have to shoot more than one shot with this brute. They said no one is enough if you hit it.
Well I was off the hook, simply no contest. I toke all my plains game with one shot each except one, the Kudu toke two, all with 139gr bullets and on 175gr Round nose on an Impala. And we shot a whole lot of other small stuff like a type of burrowing rabbit and a Warthog.
Also had a tremendous dove shoot in a big Sunflower field. We had a bunch of kids running on all four doing the retrieving, they never lost a bird. It was scary to have all these kids runnining around in front of your gun. They loved it for they kept all the birds.
Anybody with an 06 or 280 (7x64) is well off. 280Rem ammo was not available so you should bring it with you. There were two simple wildcats these two guys liked. A 7.62x 65 and a 7x65. Made from 270 brass. The forward part is 308 Win or 7mm-08 with an 06 body blown out. The dies are either 308 ore 7mm08 with an extension. Spells cheap with a local reamer.
Performance is like a 300H&H or the 7mm mag. fitting a standard long Mauser or the local Musgrave action with no modification. Brass and bullets are mostly all local.
One local gov. hunter used a 223 to cull Buffalo with armor piercing bullets. One shot game over. These guys really know how to shoot.
The big killer was the malaria medicine, god did it make me sick.