Why? What purpose are you thinking about moon clips? For easier loading or for easy extraction?
For loading, just get a $10 speed loader. For extraction, it's not needed on .357M/.38 since the cases are rimmed.
Moon clips are only for semi-auto chambered revolvers like my Taurus .45 ACP or S&W's 625 .45 ACP. There are other models out there that use semi-auto chambers, too.
The clips are so you can extract the rimless (so to speak) cases. The extractor pushes on the clip like it would on a rimmed case. Personally, I can't be bothered trying to load the clips. I just put my .45's in the chambers and then use my cleaning rod or a pencil/pen or a screwdriver to push them out.