When cast on a container such as a quiver or a pouch that contains nonmagical ammunition or shuriken (which does not include special materials, alchemical attributes, or nonmagical treatments on the ammunition) at the start of each round this spell replaces any ammunition taken from the container the round before. The ammunition taken from the container the round before vanishes. If, after casting this spell, you cast a spell that enhances projectiles, on the same container, all projectiles this spell conjures are affected by that spell.