Raimey, Thanks for the info and quick response!

For the bore diameter, how is that interpreted to mean a 9.3mm or whatever it actually happens to be bullet?

The chamber cast looked to be exactly 9.3x74r (that is a reasonably unique looking cartridge). It is included with the gun. It was supposedly test fired successfully in this cartridge after casting. Looking over two different editions of cartridges of the world, I didn't see anything else in the 9.3 size that looked anywhere close to 9.3x74r. Do you have any idea of what it might be, a wild cat or obsolete? Or even better, an obsolete wildcat? grin