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Have you hunted buff before / do you have experience with them.

Are you a good shot ?

Are you fast on the reload and re shooting ?

If you do have experience etc and yes to the above, then the 9.3 should be fine, especially with 286 and 320gn Woodleigh's.

If not, MAYBE go with something bigger.

It also depends on are you going for Big Bulls or just whatever you come across ?

Big bulls take a bit more punishment that the average cow or teenager.

I shoot them with anything now but make sure of my shots.

I used a 338WM on a big bull this year but got the shot placement 100% perfect and I was fine. And it was in a potentially dangerous situation (close in, thick scrub).

Anyway, keep posting if you want and discuss it further.