7.92 X 57mm Mauser
The 7.92×57mm Mauser (designated as the 8mm Mauser or 8×57mm by the SAAMI and 8 × 57 IS by the C.I.P.) is a rimless bottlenecked rifle cartridge. The 7.92×57mm Mauser cartridge was adopted by the German Empire in 1905, and was the German service cartridge in both World Wars. In its day, the 7.92×57mm Mauser cartridge was one the world’s most popular military cartridges. In the 21st century it is still a popular sport and hunting cartridge that is factory produced in Europe and the United States.
Read more about 7.92 X 57mm Mauser: Development, Military Use, Civil Use, Cartridge Naming