[FrankenMauser]

Have you dry-fired the pistol much?
It sounds like chamber peening may be causing cases to hang up.
A less likely possibility is the rim relief in the slide face being too small - either because it is just too small, or because the ammo is out of spec and the rims are too large.

I have two Buckmarks with an estimated 210,000+ rounds through them.
The problems you're describing would usually be a filthy gun that needs a proper cleaning.
If there's an additional mechanical problem, it would typically come back to extractor, tight chamber, and/or ejector.


Edit:
That's strange. The last three (new) posts were not visible until I posted my reply. Gonna leave my post anyway.