Oh im sure he felt it. The brain isn't fully dead until its gone several minutes without oxygen. Thing is. The brain doesn't have any nerve endings so I guess the only pain he would feel would be the entry site. Honestly I don't know but I don't believe that saying " they died so fast they didn't feel a thing"
You so do.
He was out before he can even feel the pain from entry wound, bullets dont just pierce a straight line, they create a massive hydro shock inside, half his brains was instant mashed patateo