Ammunition

Ammunition is the term used for the projectiles fired from guns.

Fallout, Fallout 2 and Fallout Tactics
Some guns can use multiple types of ammunition, some of the most common variations being Armor Piercing, Full Metal Jacket and Jacketed Hollow Point.

There are three major statistics attached to ammunition: Armor Class Modifier, Damage Resistance Modifier, and Damage Modifier.

''Note: The Fallout 1 engine does not implement the ammo modifiers, so there is no difference between JHP and AP ammo. (explanation thread)''

Fallout 3
Unlike previous games, in Fallout 3 there is only one type of ammo available for each caliber.