As I said above, I would rarely use my gun if I had one when the zombies attacked. I, too, would choose a sword or tipped spear, because of the ammo issue.

However, we don't know how much force would be required to kill a zombie. I'm assuming one would have to render a chunk of the brain useless, since if their hearts aren't beating, blood couldn't have any use in their bodies. In this case, would you rather use a 9mm pistol, effectively swiss cheesing the brain, or a .357 magnum, blowing a chunk out of a skull? Here, a steel plate was shot with one .357 round and two 9mm rounds. The plate was about 1/8 of an inch thick. Guess which one made the gaping hole.