I would point to the real world incident of the North Hollywood shoot out, where the assailants had made suits of armor from Aramid. I believe this constituted soft armor, probably equivalent to II or IIIA. The buck shot from the LEO 12 gauge shot guns had negligable effect on the assailants. Now mind you these guys had taken drugs to minimize pain, and were probably mentally prepared to be shot, so it may not represent all cases. This also doesn't address slugs, but it seems common sense that if a shotgun round to the chest fails to stop an assailant, it's time to try something else, be i