If the factory moon clips will work with Winchester Brass they must come with .020 TK Custom Match Moon Clips from the factory. My 442 Pro Moon Clip came with TK .025 Clips.
TK List 3 different Moon Clips for the 627.
Number 1: .020 TK Custom Match for Winchester Brass & Hornady Brass
Number 2: .022 Stamped Blue Clips Generic Fit listed as fitting most brass.
Number 3: .025 HearthCo Match For Remington & Starline Brass. They should be the most heavy duty of the 3 listed.
I have gallon Jugs of 38 Special Brass of about every brand that I have gathered up the last 40+ years. What I have done is sorted out my Remington and Federal Brass to use with Moon Clips.
In Remington I sort the ones with
RP Head Stamp Only.
They seem to all fit in my .025 Clips.
All the UMC, REM-UMC, and Peters brass goes back in the jug for general purpose use. You cannot count on it all fitting in the .025 Clips.
With Federal I sort out the ones with Federal spelled out. I have found FC headstamp that is to tite to fit in the clips.
I have plenty of brass with RP headstamp, and lately I have just sorting it out.
I have not checked all Winchester Brass out. So I am not sure about all of it being the same either. You have Winchester, WW, WRA, Western, I believe WCC is Winchester, and I believe a couple other head stamps.
The First Step is deciding what Brass to use. Then get the correct moon clips to fit it.
If you have lots of range brass you will probably discover sorting all the brands is a real pain. I have almost 100 different head stamps collected. I gained 2 more last week. One was only marked 38 SPL on the bottom, No Maker on the top. I thought that was interesting. I recommend sorting by RP or (WW / Winchester) Only depending on which clips one wishes to use.
(WW / Winchester) and RP will no doubt be the most common head stamps for Range Brass.
To answer the Question The HearthCo Moon Clips that are .025 should work fine with RP and Starline Brass. TK can fix you up.
http://moonclips.com/
Bob