Just a note on historical issue: historically, Argentina used a 7.65 x 53mm cartridge in it's rifles and most machineguns. The Argentine Mauser icartridge became a standard in the region, being adopted by Peru and Paraguay as well.
7.62? Your notes say 7.92 x 57mm. Anyway, the differences would be a slightly shorter cartridge, and a bit less recoil, at the cost of a bit less long-range capability (though still more than the average infantryman can use).