A couple of things you need to know about moon clips. First, there is no standard for the rim that the clips fit for 38/357. The clips that came with your 686 Pro are 0.025 thick. These will fit most brass but not Winchester. For W-W brass, you will need 0.020 clips. Second, Although you you can load the clips by hand, you really need a moon clip loader/unloader. I recommend the BMT. It's more expensive but it loads and unloads (you don't need two separate tools) very quickly and easily.

Dpapa, I too have a dozen or so S&W revolvers and 2 M-41's. If you're ever in Virginia, stop by and we can compare collections.