Mike,
Sorry for the long delay but, I think you may have found something. I finally slugged the barrel as well as re-casted the chamber to include some of the barrel. The bore is .435 or 11.15mm. The rim is 13.36mm, base is 12.28mm, neck is 11.86mm. There is a slight ridge in the chamber that would allow a case length of 68.90mm. The length of chamber to lands is 71.84mm. Just beyond the slight ridge at 68.90mm is a smooth portion approximately 3mm long with diameter of 11.3mm. Could be slight neck. With digital calipers the bore reading would vary from 11.1mm to 11.2mm with 11.15mm being the most consistent reading. I got the same reading on the slugged ball as on the cast of the barrel. All other readings should be really close but, I do understand there may be some slight variations. Any further help is much appreciated.
