The 7.62x54mmR is a rimmed rifle cartridge developed in the late 19th century, primarily for use in military firearms. It was first introduced in 1891 for the Mosin-Nagant rifle and has since been used in various other weapons, including machine guns. The cartridge features a bullet diameter of 7.62 mm and a case length of 54 mm, making it one of the oldest military cartridges still in use today. This cartridge is known for its effective range and stopping power, making it suitable for both military and civilian applications. It has been utilized by several countries and remains popular among shooting enthusiasts and collectors. The 7.62x54mmR is often compared to the 7.62x51mm NATO cartridge, though they are not interchangeable.