Since the Belgians adopted the Mauser first (1889), it would be more accurate to say that the Turks (1890) and Argentines (1891) used the Belgian round. Actually 7.65x54 was the first smokeless powder cartridge offered by Mauser in its military contract rifles. This was followed by the 7x57 and later, with the introduction of the stronger 1898 action, by the 8x57.

Belgiumicon used a standard length infantry rifle and also two carbine variatons, a common practice at the time.

Jim