considering that the countries mentioned in your post are really the only countries in Africa actively marketing hunting opportunities ( with the exception of Cameroon offering specialty hunting for Bongo, red buffalo, and forest elephant ) I think the word many is justified. Before the demise of hunting in Kenya and Zambia ( northern Rhodesia) it was approved for all dangerous game.
The 9.3 actually originated in Africa in mainly German ruled colonies because it was designed around the common 98 Mauser action. Military cartridges were banned from ownership so they could not fall into hands of natives and rebels.
It then became quite popular in Scandinavian countries for use on Elk (moose) and bear.