Seattle,,,,,,,,,I believe that whatever cartridge you use in Africa, either from the 9.3x62 on up, you still may have some serious shoulder issues.
What fun is it to have a rifle and not enjoy 20-40 rounds at the range. Ok! 10 rounds then.
Regardless of cartridge, another approach would be to put a muzzle brake on the rifle.
If I were you and considering your shoulder problem, I`d rather have a cartridge more suitable for caped buffalo, WITH a brake and less recoil, rather than a less powerful cartridge without a brake and more recoil.
Yep! It`ll be noisier with more flash, but as the `ol saying goes,,,whatever advantage is gained somewhere, there will always be a dis-advantage somewhere else.
Something else to think about uh???
Thanks for the suggestion. I appreciate it very much. However, I failed to mention I'm about 60% deaf in my left ear. If I were to lose the hearing in my right ear, I'd be up a creek.
Also, I had a nimrod launch a braked .338 Win Mag right over my head at a range of about 15' while elk hunting in WA state. After I recovered (it took about 12 hours for my hearing to come back to normal), I swore then and there I would
never do that to another human being.
These two things mean muzzle brakes are out for me, even if it means giving up what I love most.