Using depleted Uranium rounds, I've seen a .50 bolt action rip the door off of a car. No joke.
I was at a range in Bradford County today, shooting the genteel little Lady Smith, when somebody set up one of these .50 things. We were 30 feet away and we could feel the wave of air hit our faces; the gases shot out and blew stuff into the air and just about scorched somebody who was unwise enough to have moved up close to see it.
Pretty impressive. It certainly got a good crowd at the range, at least!