Don't know about being an expert at anything
but your 30-06 is ample for any African plains game Mr. 16. In fact, I'd recommend the 165 grain bullet if your rifle shoots it well. That said, use a quality bullet and one designed for big game. You should feel less recoil with that bullet weight, and they do well in the accuracy dept. If your rifle doesn't shoot those well, and you just prefer the 200 gr bullet, no problem, but depending upon where you hunt, your average shots may be 50-100 yards or 200-300 yards. RSA for example has extreme variations in topography: flat, open plains; dense riverine, high mountain ranges or deep, brush covered valleys. Match your rifles zero with the right bullet for the estimated ranges and you can take anything from Springbok to Eland. If you plan on hunting any of the small, pygmy antelopes, I'd recommend either taking a 223 or borrow a rifle from your PH. You can email me if you have any questions on where/when to hunt.
Good hunting,
grayghost