While I've never seen the man in question I know some people who've met him in person and what I hear is that he's actually kind of huge. His son is also about as tall as him. Colossi striding about the earth.
230 grain load + casing, powder, and primer means probably around 350-400 grains per round. That by 14 rounds is 3/4ths of a pound just in ammo. Plus two barrels, and a double-wide slide and receiver!
At 6 yards, just throwing the gun at someone is going to have as much stopping power as a 9mm.