Red,
I know this is an older post, so I apologize for my tardiness. The picture here is of two Ruger Bisley Dave Sams rebuilt for me. The top is an 8" .41 Mag with a 2x Burris Dot, Douglas Barrel, free wheel pawl, and all the works. It is almost as tight and accurate as my Freedom Arms 454.
I believe the bottom gun, however, is just what you are describing. It started life as a 7.5" SBH that shot terribly. Dave retrofitted the Bisley parts, did a full action job which required making oversized pins and a bolt, installed a free wheel pawl, locking base pin, Bowen rear sight and custom front, and recut the throat and crown of the barrel while removing the warning label. It now shoots as good as I can hold, and packs incredibly well. I don't like the grips, but they're what I had with the Bisley parts and simply have never taken the time to change them. No matter who you go with for a build, ensure they use a Bowen rear sight. It is far and away the best thing going for any Ruger SA or DA. I have them on all my Ruger revolvers and they're the cat's meow.
http://filebox.vt.edu/users/jakeeney/Fi ... ce/Bisleys
Sorry for the picture, but I took it for insurance purposes only and never intended it to be posted. Enjoy!
~Jim Keeney