A 240/250 grain cast flat point or semi-wadcutter loaded to anywhere from 800 fps to 1,000 fps (whichever is comfortable for you) with any powder that produces the best accuracy (which could be one of about 30 powders or so).
When you find the load you want, if you intend to keep the revolver for life buy ALL the components NOW to last the rest of your life. if you can.