I have never been interested enough in what a 500 plus grain hardcast could do out of a 45-70 to fool with them. I have, however, played with the 500 softs but, even in the strong Ruger #1, I haven't gotten enough speed to get the test media expansion I'd like to see for use on game.
I can in no way speak for what might stop a charge on a Cape bull. I do know that people tend to be much more impressed by the absolute power of their weapons based on the noise and recoil, as well as the size of the cartridge, bore size, etc. What I do know about animals that don't give up easily is that none of those things seem to matter a whit. Then, only where the hole(s) are counts - and, of course, long holes give you better odds of getting some proper "where."
Sometimes, the air you 'let in'matters less than the air you 'let out'.
