When I was a wee lad my step dad got shot in the stomach from close range in our driveway. He ran around the side of the house and into the kitchen, got to the phone to call the police, and barely had any blood coming out at all. He didn't even realise he was shot for a couple minutes. The lack of blood pools does not surprise me.
Well you got me there anon. The caliber is not anything I considered. Not a gun enthusiast myself.