It’s the shock and the vortex caused through the animal that does the damage, I use evo greens from RWS, exit wounds are never bigger than a 50p but internally they are devastating (admittedly they fragment slightly) but exit wound isn’t all that, years ago I used to shoot burger vld hunting, if you hit a rib you’d fit a football in the hole, if not they’d pencil through!!
What I’m trying to say in my waffle is, as long as what you are shooting falls over and suffers little then don’t worry about the exit hole size
Happy hunting