Dangerous game rifles are hunting rifles first, foremost and always. Charges are for the most part, an interesting fantasy so don't plan your hunt around that. A realistic scenario is you tracked then stalked to relatively close range to a bunch of black blobs that smell like cattle in the thorn bush and you are sort of wishing desperatley that you had brought some compact binos so you can make head from tail before they take off like a bunch of scared dusty rabbits and you have to start over again on another herd and/or another day on your rapidly ticking clock/calendar. If the stars, wind and luck align and you can identify a shooter bull in the bunch and you are carrying an iron sighted or dim little low powered scope that is an eighth of the binos you never brought then you'll likely have some thoughts about which orfice they could be shoved up while you watch the afore mentioned black dusty cattle smelling bunny rabbits bugger off on you before you can find a way to thread a bullet though the brush.
So anyway; bring some scope.