For what it's worth ,I had a 386 S.C. mountain revolver a few years ago.
Although bought used ,it was like new. I fired it ,and cleaned it with
the lead remover cloth ,and in short time the cylinder face began to
erode ,with striations extending out from the chamber mouths.

I traded it back into the shop where I bought it, and they sent it back to S&W.

I also had a 325 PD ,and sold it, after a while. But thankfully had no issues with it.

I have few uses today for any scandidium or tigranium revolvers, they
are just too spooky-light.

The 646 mentioned earlier might be the exception to me ,but, it would have to be one smokin deal.
These are just bringing too much money these days.

Regards , Allen

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NRA cert.instructor&R.S.O.