I have heard of some people being shot and they say "I felt something but I didn't know I was shot". When I hear this I say that they must have been shot with a very small caliber bullet, like a 22. Thats why I have a 9mm and a glock 27 40cal. If I have to shoot someone I want that person to know he have been shot. I was wondering is it possible for a person to be shot with a large caliber bullet and not know he was shot??