Patagon hunter, of course I know that the 7.65x53 Belgian, Turkish, Argentinian Mauser cartridge was the Service number of Argentinia. But the 7x57 was the Service cartridge of several neighbouring South American countries: Chile, Paraguay, Uruguay, Brazil, Venezuela, Colombia and more up to Mexico.Many of these states got their military arms from Ludwig Loewe = DWM. Those Army sporter/gift rifles that ended up in Argentinia need not been delivered directly from Germany, but may have accompanied shipments to other, then poorer countries with even less big game hunting then, from where they were reexported to your homeland.