The 8mm Gasser (8x27mmR) is a rimmed cartridge used in the Rast-Gasser M1898 revolver and a small number of converted Mauser C96 pistols. Its bullet is cylindro-ogival and is of the jacketed type.https://www.iwm.org.uk/collections/item/object/30026625
See also List of rimmed cartridges
References
External links 8mm Gasser on MUNICION.ORG