i don't see why people aren't tricking zombie more.
they are DUMB, just trick them by making bait to attract them in the opposite way that you are going. turn on the tv, turn on the radio. throw them away,
or use them to make a ambush, turn them on with the volume at the max level, that will attract every zombie within 1 km square, at least. the volume could bury the sound of gunshot. at least 9mm and .22.
then,from a safe place, you can take care of them.
the bait could be made of a pocket radio with foam on it to absorb the shock from throwing it.
or if you are sure to be able to take care of everyone, just use a living bait, maybe another survivor who could make noise and take cover while you take care of the horde
why not use similar tactic to attract zombie into a hole or a pit or a trench ? then take care of them with whatever you want.
you could also just leave traps, but BE AWARE to leave sign for others survivor to be able to avoid those traps. fortunately for us zombie can't read
something like bear traps or similar device could hold in place zack until you can take care of them
landmines MUST BE AVOID AT ALL PRICE those aren't made to kill but only the cripple people, use it and you just made a bunch of crawler. but flare traps or cyalume traps could help too.
those are some idea that can save life, with that you can even preserve resource including ammo.