I have several of Mark Sullivan's videos. His style of hunting is certainly unique to say the least. He says over and over in them that he wants to give the animal he's hunting the right to choose how he's going to die as he approaches wounded animals until they charge. All that said, his .600 double rifle firing a 900 grain solid that he uses to blast brain shots withing just fust a few feet of where he's standing is quite a cannon.