Accurate shot placement is going to have the biggest effect on any animal, charging or not. If you slightly miss the brain on a buff it will just as likely as not look at you.

But during a charge I suspect the first reaction is just to shoot it "somewhere". And if somehwere is the biggest spot then it is probably a body shot, and then bullet energy from a 458 is a whole lot bigger and better than from a 9.3.