Do bears, of any type, take less "killing" or "stopping" than big/dangerous African game?

I've happily taken bears (several black, one grizzly) with .375 and .30-06 rifles. Shot the grizzly with a .30-06, though there was also a good hit from the guide's .338 Win Mag.

Never hunted Africa, but I'd sure like to do so someday, particularly for cape buff and a gemsbok. That hippo video above was pretty intense!

Thanks, Guy