How far are the shots on bears in Russia?

There really is no right answer to your question. I haven't shot Cape buffalo, but I've shot our buffalos and scrub bulls with both .375 H&H and .416 Rigby. I own and prefer the latter, but there's nothing wrong with the former. You just have to determine what you can manage combined with what you actually fancy. If you haven't done lots of big bovine hunting, I read that most professionals will recommend a scoped .375.

Good luck in your quest, and welcome to NX!

Ben