the ideal round is a .223 incendiary. basically flash fries the brain upon penetration of the skull cavity. rendering the zombie form absolutely dead. but there are many accounts of lesser rounds being effective, so as long as the shot is placed within the cranial cavity and effectively disables the brain then yes it should work fine.
Will a .22mag take out a Zombie?
in my opinion the book World War Z was an incredible read. absolutely nothing like the movie. not even the same plot line. the author put a lot of thought into the zombie apocolypse. and the book is a very realistic representation of how it could possibly pan out. i highly recommend it to anyone.
Got one. Not as pretty as yours, but has seen action.
I think a 22 is.......The most readily available everywhere.