I don't love being a downer or anything, but moonclipping a 6 or 7 rd 357 is not going to be very rewarding in my experience. I did it with a beloved 66 and discovered that moonclips just don't work as well with rimmed 38/357 cases (and their thin, irregular grooves) as they do with auto-loader cases like 45 acp (which I also have in a moonclipped gun). (Not to worry, though; I still shoot the 66, just without clips)
Even the best moonclips for the .357 (which are indeed the Hearthco, and which I have) don't hold the rounds firmly enough to be as fast as a good speedloader and practice. A reload with moonclipped .357's is like putting pajamas on a spider. A .45 acp is a whole 'nuther matter, of course.
Mark Hartshorne at Pinnacle-guns.com is a good smith capable of the work, if you decide to have it done. All you'll have to ship is the cylinder.