The 7.65×53mm Argentine (designated as the 7,65 × 53 Arg. by the C.I.P.) is a first-generation smokeless powder rimless bottlenecked centerfire rifle cartridge developed for use in the Mauser Model 1889 rifle by Paul Mauser of the Mauser company. It is also known as 7.65×53mm Argentine rimless, 7.65mm Argentine, 7.65×53mm Belgian Mauser, 7.65mm Belgian (in the United States), and 7.65×53mm Mauser (in Belgium).
The 7.65×53mm Argentine was the result of considerable experimentation by Paul Mauser to optimize the bullet diameter for use with the new smokeless propellant introduced as Poudre B in the 1886 pattern 8×50mmR Lebel that started a military rifle ammunition revolution. At the time of its development it was a high-performance smokeless-powder cartridge. Judging by the dimensions of the casing, it was developed from the earlier Patrone 88 adopted into German service.
This cartridge was loaded commercially by many manufacturers in the United States until about 1936. Sporting ammunition in this caliber is still loaded in Europe. Norma, Prvi Partizan, and Fabricaciones Militares (FM) currently produce 7.65×53mm ammunition. Cases are easily formed from .30-06 brass; just resize and trim. For charging the cartridge, use .303 British load data.