Plus 1.

I would select the 9.3X74R over the 30-06 especially in a double rifle, but I would select the 9.3x74R, or the 9.3X62 rimless over the 30-06 for any rifle I was going to use in Africa, simply:

#1 because the caliber is legal in a lot of places for the big 5, and the 30-06 is not legal for anything larger than a Leopard of the big five in MOST places in Africa, and for none of them in many. None of the 30s are legal, nor up to the task.

#2 is the fact that the 30-06 is a rimless cartridge, and IMO is not suitable for a double rifle that may be used for anything that bites back. The tiny palls that are needed for extraction in the double rifle chambered for a rimless, or belted rimless cartridge makes them a liability in a double rifle.

#3 The 9.3 cartridges are simply better hunting cartridges for large animals than the 30-06.

This is my opinion only here, but an opinion that is shared by the majority of PHs, and game people in Africa! That fact alone is good enough endorcememt for me!

The 30-06 is a fine cartridge, but my advice is stick to bolt actions, and for it or any rimless cartridge, and leave the double rifles to use the rimmed NE rounds!