I use two of the same loads as Steve C described above: 13.0 of 2400 and 6.7 of Unique. Sometimes I load a little less Unique (6.0) depending on the mood, and I just started loading Berry's 158 grain plated bullets over the 2400 charge. It's all good. I have used 13.5 grains of 2400 with both hard-cast lead and plated with no problems, but settled in on the slightly lesser charge. Duckbill: congratulations to both of us on new no-dash 686s with the long barrel and adjustable front sights. I just bought one off a forum member and have had it out to the range twice so far. Lots of fun, although I haven't started to fool around with the adjustable sights. I hope you're as satisfied with yours as I am with mine.
Dennis