My sons and I have used all three calibers, 8x57(160TTSX), 9.3x62(250TTSX) & .375H&H(300TSX), on Plains Game large and small in Namibia. None were found wanting and none outshined the other two. If you want the 9.3x62, which is a great cartridge, then I think I would re-barrel it instead of reboring it. I also think the simplest solution, if you want only a standard size action is to get a .375 Ruger. That way you will have all your bases covered for both Plains Game and Dangerous Game anywhere in Africa.