7.62x53mmR - Wikipedia, the free encyclopedia
Use this to deside if you can safly shoot it as you are talking about.
The 7.62x53r is actualy 1mm shorter then the 7.62x54r
The 7.62x53mmR is practically interchangeable with the 7.62x54mmR, the 54R will fit into the smallest allowed chamber size for the 53R, but is nevertheless a different cartridge made to different C.I.P. standards. Using military steel-jacketed 54R Russian ammunition in weapons made for 53R Finnish is not recommended, as it may rapidly wear out the barrel. Even worse, there is a possibility that the resulting pressure from the steel-jacketed larger diameter bullet is too much and firing it may result in severe damage to both the rifle and the shooter. Using the 53R Finnish in a rifle made for the 54R Russian is however safe, although it may result in accuracy well below the weapon's potential.