The ivory hunter Wally Johnson reported a Cape Buff that took 5 shots from an assistant's 9.3x62 before he ended it with his 375 H&H.
Sounds like Johnson may have had shot placement issues. Not understanding the context, this may be a quite reasonable scenario. Where were the shots placed? Did they even hit the target? Was he using soft points? Did he have to shoot through brush?
Too many questions and not enough answers. You can kill just about anything with one shot of a 375 H&H after it has absorbed 5 rounds of 9.3x62.
I believe I read a story once about Karamojo Bell killing a Cape Buff with a single shot from a 6.5×54mm Mannlicher-Schönauer. I don't think there is a person on this board that thinks a 6.5 is near the stopper of a 9.3x62.