Originally Posted by
RevolverRob
Physics doesn't matter when we have super projectiles! Super projectiles, I might note, that expand to ~.50" in diameter. Where as our 12-gauge friends start out at .70-.73" in diameter and usually get bigger (i.e., spreading buckshot or expanding slug).
Actually, semantic argument, there is a place where a 5.56 might be superior to buckshot or slugs at room distances - in places where soft body armor might be in play. But beyond that, I can't think of instances where I'd prefer a 5.56 to a 12-gauge load at across-the-room distance.