These are Revolver Supply Premium moon clips. They are designed to work in the S&W 627 8 shot chambered in 38 Spacial/357 Magnum; aka S&W 327 and TRR8.
They are 0.022" thick, made from high carbon steel and are heat treated and a Nickel plated finish is applied.
They have been tested with Remington, Federal and Starline brass. They might be OK for Winchester Brass.
The plating process will add 0.001" to 0.002" of thickness to each moon clip. So use these for a tighter fit that the blued 0.022" moon clips
These are useful if you have the moon clip holders that have magnets to hold the loaded moon clips.
These clips are NOT made to fit Hornady Critical Defense & Speer Gold Dot ammo!
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Best size for most ammo
These seem to hold most ammo a little tighter than the .020 ranch clips that I have. Just as easy to load with the RS loader.
The 022 blued were allowing the cartridges to sag a bit, the nickel plated 022's snugged things up some yet still easy to load. Fast service to Canada