RE: neck shot
I saw a neck-shot doe once spew so much blood it looked like it was being sprayed out of a garden hose. (I wasn't the shooter; just saw the aftermath.) Having said that, it is an extremely low-percentage shot. Like someone mentioned above, there is just too much meat and the carotid artery and windpipe present too small a target. If you've got a neck shot, just be patient and you'll more than likely get a lung shot -- where the size of the target grows exponentially and your margin of error is much greater.