The question would be though, if you gun down a bunch of zombies, would other zombies not be attracted to the pile of bodies, which, if you killed them too, would then attract MORE zombies that you'd have to kill...and so on and so on, resulting in you having to deal with an even larger group of zombies in the end?
So instead of just killing zombies, is it better to hide and let them live/wither/die on their own?
Or should you plan for long-range kills so that the dead zombies will be further away from your 'safe area' and will not be specifically attracted to your refuge.
That said, since zombies are already 'dead'....are you really killing them?
And personally, an MG-42 with it's high ROF would be less than ideal unless you have to deal with a huge swarm of them. It'd burn through your ammo stock way too fast. Much as I like the MG-42, I don't think it's the right choice except for a swarm of them.
And now, back to reality....