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Much later it was rebored/rerifled and rechambered in Germany to an 8mm cartridge. The "Repair" crown/R mark is faintly visible abve 7,8 mm. It was reproofed 935 = September 1935 by the Zella – Mehlis proofhouse, shown by the ledger number 16. But you should recheck the "new" chambering: The 7.8 mm bore / 57 mm case length speak more for a 8x57 I. The minimum bore diameter of the 8x56 M-S was 7.9 mm then. In 1935 the 8x57I was a common hunting cartridge in Germany, while the 8x56 M-S was a rare bird.

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Here's a bit from the 1939 Stoeger Catalog. Perhaps not directly relevant to tact1's M1900, as that's not exactly a 'converted military rifle', but it may be of interest: