Even at 7 yards, the pattern of the Judge is too wide, and will cause some of the load to miss a bad guy. Not only are you responsible for every pellet you send down range, but if they miss him, they do not Stop him.
Not that surprised; rifled barrels, let alone super-stubby ones, never work well for shotguns.
I'll stick with the 17 rounds of 124gr JHP in the ol' M&P for now. At least I know where they're going when I squeeze the trigger.