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I took your advice and sent the cylinder from my 637 to http://pinnaclehighperformance.com. I am very pleased with the results. Cylinder not only cut for moon clips, but chambers are chamfered. Total turn around time from when I put the cylinder in the mail until I had it back in hand was fifteen days.

I bought some TK Custom moon clips. They work well. I can reload a lot faster than with either speed strips or speed loaders.
https://www.tkcustom.com/products/swjx5-025-blue

One caveat, Federal HST's do not play well with moon clips (or speed loaders) because they have the same profile as wadcutters. There is no exposed bullet to guide the rounds into the chambers. This is not a criticism of the work done, just an observation that this load does not work well. I solved that problem by switching to 135 gr. Gold Dots.

The cost was $85 plus $10 return sipping. Total project cost, including initial shipping and moon clips is about $140.

I would highly recommend this service if you are a revolver aficionado and either compete with or carry such.

I have a Performance Center S&W 637 which I love. I wish the cylinder was cut for moon clips. Can anyone share an experience with sending their revolver off to have the work done?