Frank,
Sacramento Johnson has more experience than I with this. I had never shot BP in my Ruger before this month. By sheer luck, the method SJ describes for cleaning and prepping is almost EXACTLY how I clean and store my stainless guns using smokeless powder (I use Tetra Gun grease on my cylinder pin - just because Wal-Mart ran a clearance special on the stuff - large 1 oz / $4.50 tubes marked down to $0.50 - and I bought all they had). This worked out well for my using BP.
All my Rugers are stainless and have had the actions tuned only to the extent to insure smooth operation, proper hammer / trigger relationship, and proper timing. Nothing has been done to create extra tolerance/cleance for use with BP. I only ran 23 rounds through mine, but it showed no evidence of seizing. When I got home, I took off my grips, removed the cylinder, and submerged the entire gun in hot soap and water in a small plastic wash tub, scrubbing with bore and cylinder brushes every so often. After the water cooled, I blew the water out with compressed air and soaked in WD40. I then blew that out and soaked with Ballistol. The next day, I brushed and wiped all remaining BP residue and recoated with Ballistol and wiped almost dry. I again lubed the cylinder pin with Tetra Gun grease.
I am going to use my two 4.75" Rugers in our monthly CAS shoot on Sunday (and, after giving this some more thought, probably use Ultramax smokeless as I have a lot of it on hand and I would have to make a special trip and buy BP or BPC if I wanted to use either of them for this outing. I'll pick up more BP or some BPC rounds on one of my next 'regular' trips). Before, I head out, I will wipe them dry as possible (except for the cylinder pin). If I have any concern, its whether I am getting all the water from out of the lockwork. I have never disassembled more than the grips and removing the cyclinder. I leave the rest to a gunsmith.
PS. You may have noticed that it takes me 'many' modifications to complete a post. Our home computer shuts off every few minutes unless some actual Internet activity is detected, so I have to submit often or risk losing everything. I am too slow a typist to get it all done at once. Thanks for putting up with me. Also, thank you all for joining in on this topic. I am reluctant to ever post as I don't have much to offer. I am a much better lurker.