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a comment from past experience with pistol cartridges that normally headspace on the case mouth (SW M25 in .45acp), but are instead loaded in full moon clips ...the extractor groove on auto loading cartridge cases will allow the individual cartridges to move around more than a piece of rimmed brass like a 38spl...bent full moon clips can cause ignition problems... dirt under the full moon clip can cause additional problems... I'd pass on the 9mm version, until the "beta" testing is done to see if they have solved the problems..
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A bent moonclip can certainly cause problems, the simple solution is checking your moon clips before you use them. Load the moonclip with ammunition. Put the moon clip in the gun, point the gun in a safe direction (I use the corner in my basement reloading room). With your finger OFF the trigger pull the hammer back just far enough to disengage the cylinder lock. Now rotate the cylinder if it rotates easily you're good to go. I do with with all my moon clips that I carry and compete with. If they pass that check I have never had a problem with them working.
I have never had dirt under a moon clip cause a problem, evar!. I have probably close to 10,000rd through a 625 in the past 3-4 years. I have gone hundreds of round between cleaning and still no problems and I am running a really light trigger on that gun so light it only works reliably with Federal Primers.
If you select the proper moon clip and brass combination the fit with rimless brass can be just a good at rimmed brass. TK Custom and Hearthco make some spectacular moon clips and will custom make them for your brass if you want to go to that extreme and expense. Starline brass and TK Custom (cut for Starline) is always a good combination.
For carry I carry a 442 Moon clip (stainless cylinder like the 642 cut for moonclips, no internal lock). I load the gun with a moon clip for more reliable ejection and a speed strip for a reload since it lays real flat in my pocket. One problem with carry a moon clip revolver is carrying a moonclip in your pocket. Without some thing to protect it you asking for problems. There are some protectors available out there although I doubt any fitted for 9mm yet.
ETA: correction I found someone that will make a moonclip pocket protector for a 9mm moonclip:
http://www.delfatti.com/PMC%20Page.html
The only way I would get a snubby in 9mm would be if they made the frame and cylinder shorter to take advantage of the shorter cartridges. That said it would be tempting if you where carrying it as a back up to a 9mm semi-auto.