The head and neck shot is not the preferred shot. The vital organs area is the prefferend shot IMO. I suppose I would take a neck shot under the right circumstances but admittedly I have been presented with only a head or neck in the past and I always let them walk. When I was a kid I saw one go bad and I'd rather eat tag soup than repeat what I saw.
Core-lokts still get it done but there are better bullets out there IMO. Clkt's on occasion break up into many small pieces when hitting bone and cause some meat loss but they will put the animal down.
I'm not a fan of using my voice to stop game but circumstances would dictate doing it. It will stop them sometimes but they usually only stop for a second then bolt to the next state. I would rather stay silent and return another day hoping the game stayed in the general area. If it's the last day and the last hour of the hunt I suppose I'd serenade them if I thought it'd help.