 One of these was Peter Paul Mauser, and, in 1898, Rigby was appointed the exclusive importer and distributor for Mauser rifles and components for the British Empire.For sale under his family name, John Rigby also developed sporting versions of the G98 Mauser rifle and its ammunition, notably the 7x57mm infantry round.With hunting bullets, this became a highly successful stalking cartridge known as the .275 Rigby.