Shame on me: Another “what rifle?!”. Humour me!!

That's a pretty strange mix. I mean the pool of rifles you are chosing from.
So let me sort it into bolt actions and semiautos.

From bolt actions I believe the Finnish Mosin is the winner.
From the semiautos I'd go for the 858 without doubts.

Note: if you find yourself in a “WKWTFH” situation, it's a safe bet that your guns will be already confiscated by your government. However, if you seriously look for a zombie apocalypse gun, then the small, light, durable yet accurate 858 selfloader carbine beats any bolt action. 7.62x39 safely drops a zombie with a single COM hit and with properly zeroed sights you can hit a zombie sized target at 300m.

Now, go buy your .22 and have fun. :)
 
Could the CZ hit 300m? Not without lobbing the bullet, mortar-style, I suppose!!

Is that some failed attempt to make a joke?

Take the rifle (if it's not zeroed), start at 100 meters, aim at the bottom of a target with rear sight set to 3. If your groups are more or less 28 cm above the target bottom, you are set for 300 m.

But since you talk 858 it shall be zeroed from the factory. So, set your rear sight to U, and shoot any zombie sized target aiming at the waist. You shall hit COM zone of everything up to 300 m.
 
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