no shell. It's a development of the railgun. Only a metallic bullet moves. No powder, no container.
It could probably fire steel shot. If built properly, the barrel probably shoot a train of projectiles travelling in the barrel at the same time.
It's a version of the weapon in the Schwartzie's sci-fi movie Eraser.
It has to shoot 16666 projectile per second to make a million rounds per minute.
It's more akin an electromagnetic sandblasting unit...
Depending on the mass and end velocity of the projectile, it must develop a considerable thrust (just like a jet engine or a sandblast gun).
Physics rulez!
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