The .375 Nitro Express Rimless 2.25" is the 9.5 X57 Mannlicher Schönauer - .375"=9.525mm

The 9mm MS is a 9X56

The M1905 MS was chambered for the 9X56, the M1910 for the 9.5X57 (.375 Nitro Express Rimless 2.25").

M1903 - 6.5X54 (DWM477)............................................................................ M1905 - 9X56 (DWM491E)
M1908 - 8X56 (DWM528)............................................................................... M1910 - 9.5X57 (DWM531)

As noted in the 'English Ballistics' above, the .375 RNE, though the same dimensions as the 9.5X57MS, was loaded with two grains less Cordite. Both the 9X56 and 9.5X57 MS are loaded 45 grains, the .375 at 43.

Here it is in metric: