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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