The real fight stopper is penetration, specifically into seriously important organs like the heart, the aortic arch, or the brain. But the buckshot that comes out of a .410 case, particularly through a short barrel, has neither the mass nor the velocity to penetrate to any meaningful degree. Even the .410 slug is less than competent in this regard.
All the Judge will do is create superficial wounds which, although painful and perhaps even blinding, will not stop an oncoming BG. It might even make him that much madder.