Caseless ammunition

Caseless ammunition is light and does not require oxygen to function. Each bullet comes in a thin ceramic shell, which burns off from friction upon firing. This also means the slugthrower will fire perfectly well under water or in a vacuum. Of course, water resistance certainly slows a bullet. But caseless ammo cannot be reloaded and so must be purchased from a manufacturer, a store, or the black market. Additionally, caseless ammunition may only be used by weapons specially designed for such projectiles.