The weapon decay formula for FO:NV is pretty straight forward. Each shot takes .2 item health off of all weapons in the game. Example: * 9mm pistol - Health 150, 750 shots to fail (150/.2=750). FO3 uses a different formula. Each shot decays the weapon by a percentage of the weapon's base damage. Also, there are different percentage values for different weapon types: * Guns = .03% * Energy weapons = .04% * Big guns = .06% * Melee = .05% Examples: