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I have no experience with one, but I like this write up!
Some pattern testing as well.....
http://www.gunblast.com/Taurus-Judge.htm
That review seems to cover it pretty well. The rifling will spin the wad, thus spinning the shot column, which will cause the pattern to 'donut' eventually (same principal that sticks your clothes to the sides of the washing machine) . How far and how bad I suspect just depends on ammo selection. It might be interesting to try out some of the 00 / 000 buckshot loads made up for the 410 derringers also.