The .303 British cartridge was developed in the late 19th century and became the standard rifle round for the British military from 1889 to the mid-20th century. The cartridge was also utilized by British allies and Commonwealth forces. It was widely used in World War I and II in the Lee-Enfield rifles and various machine guns. The round’s high accuracy potential and long-range performance made it a reliable choice for military use, traits which continue to make it popular among historical shooters and collectors.
The Lee-Enfield rifle is the most iconic firearm chambered in .303 British. Additionally, various machine guns and other bolt-action rifles produced during the 20th century also used this cartridge. The cartridge remains a popular choice for surplus rifles today.