A head is a small part of the body’s mass. Shoot a 1/2 gallon milk jug with a high powered rifle and watch all the movement. This moves from a strict momentum problem back into a problem involving energy being transferred from the bullet to the water. Brain tissue behaves very similarly to water when struck by bullets..
That's excessive force!!! How dare you suggest we treat a valueable "member of the community" in that way?!!!
I was told in CHL class that courts don't usually like head shots. They feel it's excessive force