@Quaticman, As I said earlier the 270 is a fine round and should be fine for all the PG you listed. My concern is not the game but the shot presented and the distance of that shot. If you PH puts you on a 60" Kudu at 200 yards quartering towards you and your carrying a 270 would you shoot or would you work for a better shot. If you or your son would work for a better shot I would recommend a larger round like your 9.3x62 or a 35 Whelen. If your comfortable using a 270 for that shot then stick with the 270. The only person that can answer that question is you and your son, the rest of us can only give advice and opinions. Personally for potential PG rifles I own a 270, 30-06, 300WM and a 35 Whelen, I have been to Africa twice and I've never considered taking my 270. The 270 I used on my first safari belonged to my PH, I had to barrow his rifle because Delta left my rifles in ATL.