I would pass on those 22 s to the kekis that can't handle a bigger caliber in the group to protect themselves during a zombie raid..
You need to;
1). Have ammo available,
2). be able to carry all your ammo,
3). have magazines to use your ammo,
4). reload you ammo.
Keep all these in mind when you are trying to beat off the zombie horde. If you are holed up and pretty secure, then it really doesn't matter a whole lot, but if you are traveling, then these are items of great consideration.
Shotguns are nice, but lack serious ammo capacity and ability to reload. Just because of that I'd nix them from the list especially since you've got limited range.
30 cals I'd nix also because trying to carry all that ammo will wear you out and slow you down.
45 cal handguns, although I love them for humans would probably be out for zombies. Not enough capacity and the weight gets you into the realm of the 30 cal round again.
223 I think are pretty damn helpful for zombies.
MP5 is an interesting choice as you can share platforms between that and a handgun. Magazine availability is questionable though.