All Firearms need ammunition (ammo) to function. Different weapons require specific types of ammo and cannot fire anything else. These types are usually referred to by their Caliber (diameter of projectile), with some calibers being measured in inches and others in millimeters (.50cal being half an inch, or 12.7mm).
In State of Decay, ammo cannot be manufactured, only scavenged. While it is scarce near the start of the game, it becomes much more abundant later on, being especially common in such places as gun shops, police stations and military outposts. Similar firearm-types can overlap in the ammo they use, so certain Pistols, Revolvers and Submachine guns use common ammo, for example.
It should be noted that clean headshot with any caliber will kill a standard zombie and smaller calibers fire more quietly than bigger ones, so bigger isn't always better.
|.22 Caliber||0.01 lbs||Low||Pistols,||Light and quiet, but still kills in one headshot.|
|9mm||0.02 lbs||Low||Pistols, SMGs||Light and quiet, but still kills in one headshot.|
|.357 Caliber||0.04 lbs||Medium||Revolvers|
|.40 Caliber||0.03 lbs||Medium|| Pistols, |
|.44 Caliber||0.05 lbs||High|| Revolvers|
|.45 Caliber||0.04 lbs||High||Pistols, Revolvers, Rifles, SMGs,|
|5.56mm||0.03 lbs||High||Assault Rifles|
|7.62mm||0.06 lbs||High||Rifles, Assault Rifles|
|.50 Caliber||0.28 lbs||Very High|| Pistols, Revolvers, Sniper Rifles||Very heavy and noisy.|
|Shotgun Shells||0.14 lbs||High||Shotguns||Devastating at close quarters, dangerously loud|
|Grenade Launcher Ammo||0.50 lbs||Very High||Grenade Launchers||Very heavy and noisy; found in the gun shops.|