The 9.5X57 was the proprietary cartridge for the Mannlicher Schoenauer M1910 model built by Osterr Waffenfabriken Ges, Steyr, and later Steyr - Werke AG. It was known to the British trade as the .375 Nitro Express Rimless, or .375RNE, though the cordite load was generally lighter in cartridges listed as .375 RNE than in those of 9.5x57. Eley (Kynoch), DWM (Deutsche Waffen und Munitionsfabriken), and other manufacturers made both during the 'interwars' period of the 1920s - 30s.
The Mannlicher Schoenauer proprietary cartridges of 6.5x54 (M1903), 9x56 (M1905), 8x56 (M1908), 9,5x57 (M1910) with DWM numbers:
Eley drawing of cartridge:
The cartridge was preceded by a rimmed .375 Nitro Express and has roots with Westley Richards, who claimed to have designed it:
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