What size shell is a 7.62x54mm rifle?

The 7.62x54mm rifle cartridge has a shell casing that measures 54mm in length and 7.62mm in diameter. It is a rimmed cartridge, commonly used in military rifles and machine guns, such as the Mosin-Nagant and the PK machine gun. This cartridge is known for its effectiveness and range, making it a popular choice in various conflicts since its introduction in the late 19th century.