I shoot Glocks in USPSA and 3 gun and don't know a lot about revolver holsters, but I'd think you could get something decent from Blade-Tech or Comp-Tac. I've never seen anyone shoot a revolver in 3 gun though. A fair number of people shoot them in USPSA. For more competition revolver info (or anything else relating to action competition) I'd go to the Brian Enos forum.
