Is there a known 38 SP or 357 Mag ammo that fit the moon clips that come with the 627-5 Performance Center? I brought some home from the gun store and the channel on casing was too thin to fit on clip. I was hoping just to ask for them next time I refill my ammo. Thanks in advance.

Pretty much any ammo fits in my factory clips. Some fits tighter than others, but I haven't found a brand yet that doesn't fit.

Groo here
The moon clips come in different thicknesses.
Check with Ranch Products.

as mentioned above, the 3 moon clips that came with mine all fit ammo that I bought at Walmart, 38 or 357 in various manufacturers.

If you want to pick up more, I bought a 10 pack from Welcome to TK Custom.com & Moonclips.com and they work great.