One would hope.
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Since you said it was a leather, I would use a heat gun (30 second at a time), and try to put a pistol in it. If it does not fit, I would do another 30 seconds, and try to get it fit. From my experience, it is about 15 minutes experience.
You can use heat gun on many holsters including Safariland 628x/636x holsters.
If the holster is loose, maybe you need a bigger gun.
Funny how LITTLE heat can make leather holster tighter, but shape change a kydex type holster.
This is how I made a Safariland 6360 Sig P229 Holster with light changed to Safariland 6304 to accomodate HK P30 with light + leg shroud. :D
Is a loose holster code for something else?
No, I haven’t done anything, I don’t carry it, I just throw it I a gun rug for trips to go out & shoot it.
I like the Chicago screw idea, and the wet down the holster, insert wrapped pistol and try reforming to fit tighter then blow dry in short sessions.