In all seriousness, folks should recognize that there is only one spot on the human or zombie body that is going to cause instant incapacitation and a cessation of all locomotion. That’s the spot where the brain and spine connect and it’s not a very big target.
What makes it even more difficult is that the head is very animated, especially in a conflict situation.
Thus, it is very good idea that armed citizens train to shoot at center mass with a weapon they can control, with the best defense loads they can get, while moving to cover or physical obstacles that any “zombie” would have to over come. Extra mags are plus.
Any gun fight remember “If you’re not moving ,you’re reloading”
IIRC, it’s called the “apricot”.
“...the “apricot”, or the medulla oblongata, located inside the head, a part of the brain that controls involuntary movement that lies at the base of the skull...”
http://en.wikipedia.org/wiki/Sniper
(Shot Placement)
In all serious seriousness, I’ve worked out a new 12 and 20 gauge round which allows folks to increase the magazine capacity of their pump mossberg, or Maverick, or Remington, or auto loading TriStar, or Akkar, or Benelli, etc shogun by at least one more round of ball or buckshot. I load #2 buckshot for these new rounds then roll crimp them on an overshot card. The more in the mag the merrier, right?