The 7.62×54mmR is a rimmed rifle

Rifle

A rifle is a firearm designed to be fired from the shoulder, with a barrel that has a helical groove or pattern of grooves cut into the barrel walls. The raised areas of the rifling are called "lands," which make contact with the projectile , imparting spin around an axis corresponding to the...

 cartridge

Cartridge (firearms)

A cartridge, also called a round, packages the bullet, gunpowder and primer into a single metallic case precisely made to fit the firing chamber of a firearm. The primer is a small charge of impact-sensitive chemical that may be located at the center of the case head or at its rim . Electrically...

 developed by the Russian Empire

Russian Empire

The Russian Empire was a state that existed from 1721 until the Russian Revolution of 1917. It was the successor to the Tsardom of Russia and the predecessor of the Soviet Union...

 and was introduced as a service cartridge in 1891. Originally designed for the bolt-action Mosin–Nagant rifle, it was used during the late Tsarist era and throughout the Soviet period to the present day. The cartridge remains one of the few standard issue rimmed cartridges still in military use and has the longest service life of all military issued cartridges in the world.

The American Winchester Model 1895

Winchester Model 1895

The Winchester Model 1895 is a lever-action repeating firearm developed and manufactured by the Winchester Repeating Arms Company in the late 19th century, chambered for a number of full-size military and hunting cartridges such as 7.62×54mmR, .303 British, .30-03, .30 Army, .30-06, .35 Winchester,...

 was also chambered for this cartridge per a contract with the Russian government.