Dont you understand, velocity is everything.
Like I said before compare a 30-30 to a 300 mag both are shooting a 150 gr bullet, but whats gonna do more damage ? The Mag of course. Why.... VELOCITY!
VELOCITY=ENERGY=WOUND CHANNEL.
Remember a woundchannel is not the hole but the disruption of tissue around that hole. bullets leave a wake, just like a boat, this wake is the wound channel, not just the little hole.
This is simple stuff.

What would you rather have in your hands if a cape buffalo were charging you, a .50 caliber 335 gr muzzle loader or a 150 gr 300 winchester mag ?