)[1] is a smokeless powder rimless bottlenecked centerfire rifle cartridge developed by Paul Mauser and introduced in 1893–94.
[2] Due to high recognition of 7.92 mm Patrone 88, the presumed parent to the 7×57mm, it was marketed as M88/57/6.5 mit und ohne Rand in 1920s.
Several wildcat cartridges have subsequently been created from the 7×57mm Mauser with almost identical calibre bullets, such as the .257 Roberts, but are not interchangeable.
These all-in-one Combination guns like the M30 Luftwaffe drilling would have a mix of multiple barrels in rifle calibers and shotgun gauges in order to provide that flexibility for the hunter.
[6][7] But due to the Break action mechanism in which the breech of the firearm would lock, a reduced power rimmed cartridge would be used.