I recently picked up a Belgian Mauser sporter that was built pre WW2. Custom gun with set triggers, engraving and raised/matted barrel rib. Very nice vintage rifle. But I am unsure of the caliber. The gun was advertised as being chambered for the Argentine Mauser cartridge, but that round is too short to click into the bolt face, so I knew it was not correct. So I pulled the action and the underside of the barrel is proofed and marked as 7,8mm x 57
Some information I am finding on-line seems to point to this as being the 8mm Mauser cartridge, but nothing conrete on this fact. Would anyone out there be familiar with markings like this from the 1930's or 40's?
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