I have a S&W 360J that has been cut for moonclips and rechambered to 9x23. I usually load it with 9mm, I'm very happy with the conversion, it is very fast to reload and spare moonclips are easy to carry.
I also have revolvers in .357mag, .40S&W, and .45ACP that use moonclips and I just as happy with them for the same reasons.