[pilgram,
To clean your chamber, after trying everything else, use a 45 cal borebrush in a short section of cleaning rod, turned by a "drill motor".Mark the rod to indicate expected chamber depth, so you can tell where to stop.Once you have it clean enough to satisfy you, chamber a sized case( or factory cartridge)that has been smoked/colored with felt tip pen or "Dykem". Try to force it in with only your fingers, and then withdraw it.If it shows interference in the middle of the case, what you have is a "D" chamber.If it shows interference at the end of the neck, it is likely you have something other than a 9.3x72R; such as 9.3x70R, 9.3x 57R,9.3x48R, or 9x58 1/2 R S&S. The amount the case protrudes fron the chamber will indicate the chamber length, but nothing is as good as a "cerrosafe" chambercast. Let us know and we will finally be able to get you shooting.
Mike
