Can you insert a 9,3x72R Normal case and close the action ? There are 2 styles of 9,3x72R before the cartridge was "normalized" around 1912. I have the 9,3x72R "D" (Deutsch) version, (in a Zella-Mehlis Drilling). Modern RWS/S&B/Norma brass will not go in the last 1/2". That is, until the empty cases have been sized in a special C.H. FL die. Standard RCBS dies are set up for the 9,3x72R "E" (English) version,(so-called because they're based on a British .360 BP case). If this is your problem, you measure the chamber cast every 10mm from the rim you should be able to determine where the taper stops. If at 40mm, not more, you might have the "D" version. If so, the special CH dies are the cure.
