There is nothing ethical about a head or neck shot! As Frizz saidjaw shot deer die a slow agonizing death! The head of a deer is a small, seldom still target! It is not a paper bull's eye at a known distance from a bench rest! The neck of a deer doen't present much better of a target either! If you don't hit the spine, you've probably got a long difficult tracking job!
The thing I hear most from the head/neck shot crowd is, "its either a clean kill or a clean miss!" BULL! How many of those "clean misses" are running off to die a slow death!!!???
I agree with T/C, the only positive quality of the .22's is their low recoil. The .243/6MM offers three times the power, with not much more recoil! Then there are muzzle brakes and quality recoil pads to boot! There is no good reason to use any .22 on deer!