As far as I know the only place you can get ammo is in gun stores and I'm pretty sure that every other survivor with a gun is heading there too. I doubt you'll find any ammo in a zombie apocalypse
Ammo is heavy, how much do you think you can carry?
Thats why you stay in one fortified position during tha apocalypse, that way you just have to haul ammo to one location and stay there until you get overrun, you'll take a lot with you but if you plan on actually surviving then yeah, travel light.
The average U.S. soldier typically carries 9-12 spare mags for his/her main rifle (unless its a SAW, you're not carrying 12 drums of ammo lol) plus the one thats already in the gun. Ussually 30 rounds in each, I dont feel like math today so we'll just say thats a lot of bullets, and if you fire semi-auto you can take out a good amount of zombies before you go. Then again, these vests that can hold that much ammo are ussually very cumbersome, and even more so if its armored. My advice, carry a few extra mags for whatever gun you have and only use them when abso-fricken-lutely neccaserry....God, I can't spell right now lol. Oh, and avoid using full auto its just a waste and its really only useful in convential warfare for supressing enemy targets, I suppose it'd be good in close quarters fights since you could just spray a room of zombies in seconds, just make sure none of your buddies are in front of you :gun: