You can run any 2.5 inch shell you want. However I suggest keeping the FPS below 1200, I usually will run 1150FPS 2.5 inch as my max. Its best to use the shotshells made for revolvers. Federal,Winchester,Hornady all make Judge type of shells with FPS's below 900 FPS. The Federal 000 buck is an excellent and usually accurate load out of a Judge. Two factors to consider:
perceived recoil - how much damage to your wrist. Once you get above 1150 that recoil can leave your hand a buzzin
High brass or high speed may eventually damage the revolver, this is not proven to me personally, just rumors on the interwebs.