How does a vasectomy affect male chastity since he never expels any sperm anymore? Will a man with a vasectomy still get the same physical and emotional pleasures that one who can shoot real bullets gets?

Well, a vasectomy stops sperm, but that’s only a small part of cum (2-5%). Most of it is made up of seminal fluid, which is still produced and is what jets out, so no, I don’t think it’ll make a difference. But you’d be better reading up on it on proper medical websites, i’m not a doctor!