When it comes to z-mans i've been thinking what would be good weapon against them. I would pick .22lr pistol and .22lr rifle as a main weapons. Against zombies you won't need "stopping power" because headshot kills them and if majority of battles are fought in close range it has enough power to stop zombie.
I would also pick up .308 or 30-06 hunting rifle for long range and a pistol with bigger caliber(9mm). Not to forget shotgun, it is very useful gun.
Pros:
- lightweight ammo, easy to carry lots of ammo.
- not loud, less noise, less zombies. Silencer is not "must have".
- almost recoilless means you can shoot quickly without losing accuracy
- very common round, so spare parts and bullets are found in every store
Cons:
- Is inefficient in long ranges( still it has dangerzone of 1500m)
- can't be reloaded(rimfire) so looting is only change to get these