Gidday - I have a 1924 Mauser Oberndorf sporter - its been rebarrelled at some point with a Lee Enfield 303 barrel (and is chambered in 303 British). If I could find a 7.65x53 reamer one possibility is to set the barrel back and rechamber as Mausers don't function that well with rimmed cartridges (with a few specially modified exceptions).
Cheers
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