Gunmaker,
The typical Mauser Sporter, built between the wars, was built on a repurposed WW1 military action. This one seems to be a Mauser Oberndorf civilian action. The shape of the bolt knob, the flat on top of receiver ring is unusual, but the most telling ( for me) is that I can't see a tell tale joint, inside the trigger guard, where a typical double set trigger unit would have been let into it. It, therefore seems to be a Mauser double set trigger, built into the trigger guard, instead of being a separate unit. Markings under the action/ barrel/ rear of Mag. box should be positive ID. If it has a Mauser, rather than Suhl barrel, the chamber could have been reamed to allow use of .323" bullets, even with a .318" barrel. The 8x60 cartridge is a very good caliber, use 8x57 loads as starting loads.
Mike
