I was a huge proponent of the Mozambique drill as well as El Presidente and am still today as I have done it so many times I sometimes forget my NEW preferred drill. Aptly named Ballzambique: 1 round in the pelvic girdle, 1 round in the chest, 1 round in the head. 2 of the three shots generally are outside normal body armor protection and the firearm naturally follows recoil.
As a point of anatomy. If you ever get the opportunity to talk with a plastic or neuro surgeon ask him/her/it to show you how thick (by using their fingers) the skin, muscle and fat there is surrounding the skull. You might be suprised at how far apart their fingers are. Additionally skulls are three dimensional, the temporal bone on either side of the head is flat and fairly thin (draw a 2" by 3" rectangle and place it on top of your ear with the back edge even with the back of your ear. directly under the ear is also where the spine resides and is a fine option too at about 1.5" wide all the way around. The back of the skull is fairly well protected but center line from below the middle of the ear to the bridge of the shoulders is soft and squishy and the spine lives in there. Given the opportunity, anywhere in the neck with modern handgun ammo is going to be terminal (4 big pipes full of blood) and the closer to center instantaneously lights out if you hit the spine. Ballistic Anatomy 101 concluded for today