This thread is starting to veer terribly off topic, I really think it would be better if a mod locked/split it. Just saying is all...
Its still on topic, went from, How deadly is a .22 to a zombie, that is currently being discussed.
Protip: When shooting zombies, do not discuss how deadly the caliber is to them. they are already dead.
lrn2read
The zombies we are discussing are not undead.
zombie
-noun
1.
(in voodoo)
a.
the body of a dead person given the semblance of life, but mute and will-less, by a supernatural force, usually for some evil purpose.
b.
the supernatural force itself.
2.
Informal .
a person whose behavior or responses are wooden, listless, or seemingly rote; automaton.
Unless you meant the former, I don't think the latter is going to pose that big a threat. Zombies are the walking dead, literally. What you are discussing are rabid humanoids.