I also have and use a 9.3x74R. I have never shot a Cape Buffalo with it but have shot 30 plus Zebras, and handful of Kudu and Gemsbok a couple of Warthogs, some Springbok and about a dozen Red Hartebeast.

I love it. A very nice, light and quick package with a Zeiss 1.75x6 in Claw mounts. Scope and all at 8 pounds. You should be able to get a nice Brit 400/360 that is rechambered for a decent price, can't you?

I think it is a little light for Buffalo but if I had no choice it would be able to do it I think.