9.3x57 confirmed; article in Mannlicher Collectors by Phil Sparholt.

Wrong! The 9.3x57 Mannlicher-Schoenauer reported by Sparholt in "The Mannlicher Collector" #104, page 2, is obviously a rebarrel job, probably done in Zella-Mehlis. It is a M1908, so marked on the receiver ring, so it was an 8x56 M-S originally. The barrel shank is of an unusual shape, not seen on any other Mannlicher or Mannlicher-Schoenauer barrel. The rifle bears German, most likely Zella-Mehlis, CROWN-crown/N proofmarks, in use to the 1920s, indicating nitro proof using the special"4000 atm proof powder". When the gun was reproofed in Germany, it was marked for a StmG 19gr = 293 gr steel jacket bullet. So this rifle does not confirm Mannlicher-Schoenauers ever made in 9.3x57 by the Steyr factory, it only shows again that Mannlicher-Schoenauer rifles were often converted by other gunsmithes to non-Standard calibers.