M 98 magnum
John Rigby & Co. commissioned Mauser to develop the M 98 magnum action in the early 1900s. It was designed to function with the large sized cartridges normally used to hunt Big Five game and other dangerous game species. For this specialized type of hunting, where absolute reliability of the rifle under adverse conditions is very important, the controlled-feed M 98 system remains the standard by which other action designs are judged.[27] In 1911 John Rigby & Co. introduced the .416 Rigby cartridge that due to its dimensions could only be used in the M 98 magnum action.[28]. .416 Rigby - Wikipedia. 
. 