Welcome to the adventure of trying to pair 38spl or 357mag with moon clips.
Unfortunately the little groove in the 38spl case is not a standardized feature like an extractor groove is for autoloaders.
Manufacturers (usually) put that groove in a 38 to assure that the cartridge headspaces properly. If an ammo maker puts a groove in their 38 brass, how wide they make the groove and how deep they make the groove is slightly different from one company to the next.
Fortunately the .025" thick clips I have from TK Custom or from RevolverSupply work nearly all the time with a lot of different brands of brass.
Here is what works and what doesn't:
Aguila: Yes
Armscorp (A USA): No, groove is too shallow
Blazer (aluminum): No groove
Blazer (brass): Sometimes. Check before you buy Batches of this brass do not have a groove; perhaps made on the machinery they use to make aluminum shells.
Federal: Yes, occasionally I find some that do not accept clips.
Fiocchi: Yes
Geco: Yes
Herters: Frequently these do not fit.
Hornady (brass): Yes
Hornady (nickle): No Groove is too shallow
IMI: No. Groove is too shallow
Lake City (LC): Yes
Magtech (CBC): Yes, some of this brass has a generous groove width and the rounds wobble
Perfecta: Yes
PMC: Yes Brass shells work, less confident about nickle
Privi (PPU): Yes
Remington (R-P): Yes. Preferred brass for use with clips. I have found older brass where the groove is too narrow
Sellier & Bellot (new): Sometimes the groove is too shallow, otherwise the brass fit tightly
Sellier & Bellot (old): Yes, close fitting.
SIG: Yes
SPEER: Usually Yes...but you have to check before you buy. Batches of this brass do not have a groove, like the grooveless Blazer
SPEER DWM: No. Groove is too narrow
Starline: Yes, but the groove width is wide and the rounds wobble quite a bit.
......Note that TK makes special thickness clips for use with Starline brass (I don't own any of those)
Winchester(new): I think Winchester is making the groove wider than they used to.
Winchester (old): No. The groove is too narrow to accept a 0.025" clip.
The split moonclips may be an OK idea for 6-shot cylinders but I think they weaken the clips too much for 7 and 8 shot guns.
Always use the tool for removing the brass from the clips. It is too easy to torque them out of shape otherwise. Once bent, they are never quite right even if you manage to iron them 'flat' again.
If you will shoot it much, I would recommend finding a Plano box to accompany your 627. Pick a size to suit your needs. The one I use (approx 10-3/4 x 7 x 1-5/8") holds about 20 loaded moon clips plus a small parts kit with spare moon clips and a sight adjuster.
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