My 1922 proofed M1910 is a Take Down Model, barrel length 60 centimeters.

Would measurements of a Take Down Model barrel be of use to you?

Per the 1939 Stoeger, 'Carbine' models (stutzen) were offered in 18" on the 6.5X54 (M1903), 20" 0n the 9X56 (M1905), 8X56 (M1908), 9.5X57 (M1910) as well as 7X57 and 'U.S. 1906 Cartridge' (.30-'06):

The 'High Velocity', or 'Sporter Half Stock' offerings were all listed with 24" barrels:

Note - Stoeger did not list by the M19XX model numbers, only 'Carbine', 'High Velocity', and 'Take Down Model'. Also, Stoeger rounded to the nearest inch measurement of the Steyr barrels, which were issued in metric lengths.

Other barrel lengths were available to the U.S. customer of 1939 through special order, also likely rounded to the nearest inch.

From the options list below, an M1910 could be ordered with "Extra long barrel, up to 26 inches, caliber 9.5 m/m":

Stock dimensions - 'drop' and length of pull:

Stoeger, 1931:

Note available 22 1/2" bbl. 6.5, 8 and 9 m/m, or 23 5/8" in 9.5 m/m (presumably on 'Carbine' models). The 23 5/8" measurement is a very close equivalent of 60cm.

Phantom view MS: