Magical Companion Ammo (Fallout: New Vegas)

Magical companion ammo is a type of ammunition

Gameplay
Magical companion ammo is a special ammunition type that companions with ranged weaponry use when no regular ammunition is currently within their inventory. Magical companion ammo is infinite (unless certain conditions are met) and hidden, e.g. Craig Boone has an endless amount of .308 rounds for his hunting rifle, and as there is only his clothing in his inventory, the magical companion ammo is hidden.