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Originally Posted by Ricky B
Contrary to popular belief, these fins actually impart no spin onto the slug as it travels through the air. Since the slug is fired at a supersonic velocity, the nose of the slug pushing a shockwave creates a vacuum on the side of the slug, where the fins are located [and thus no aerodynamic effect from the fins since there is no (or little) air around the fins, at least while traveling at supersonic speeds]
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I have no doubt that the air does nothing to make the foster slug spin, but does the contact of the fins on the barrel have an effect?