7.92×57mm Mauser (8mm Mauser)

The 7.92×57mm Mauser is a rimless bottlenecked rifle cartridge. The 7.92×57mm Mauser cartridge was adopted by the German Empire in 1903–1905, and was the German service cartridge in both World Wars. In its day, the 7.92×57mm Mauser cartridge was one of the world’s most popular military cartridges.Wikipedia
 
Bullet diameter8.22 mm (0.324 in)
Rifling twist240 mm (1 in 9.45 in)
Rim diameter11.95 mm (0.470 in)
Case length57.00 mm (2.244 in)
Base diameter11.94 mm (0.470 in)
Shoulder diameter10.95 mm (0.431 in)
Neck diameter9.08 mm (0.357 in)