With renewed interest in dangerous-game hunting in Africa, the demand for big-game cartridges increased. Major ammunition manufacturers like Norma, Federal, and Hornady began producing .416 Rigby ammunition to meet the new demand. The Kynoch brand name was licensed by Eley to Kynamco, a British ammunition manufacturer, based in Suffolk, England, which continues to manufacture .416 Rigby ammunition under the Kynoch brand name. Design and specifications The .416 Rigby cartridge case is one of the most voluminous case and was originally designed to utilize cordite strands as a propellant. The large case allowed the .416 Rigby to operate at moderate pressures, yet turn in a good performance with regard to velocity and energy. The .416 Rigby was intended for use in Africa and India. As cordite was susceptible to high chamber-pressure variations dependent on ambient temperature, the relatively moderate pressure loading of the .416 Rigby provided a safety margin against dangerously high pressure levels when used in tropical regions. C.I.P.-compliant .416 Rigby cartridge schematic: All dimensions in millimeters [inches]. The .416 Rigby's dimensions and specifications are governed by C.I.P. The C.I.P. mandates a 6-groove barrel with a bore diameter of and a groove diameter of with each groove being wide and a twist rate of . Commencement of rifling is to begin at . Maximum average pressure given by C.I.P. is for this cartridge. SAAMI have listed the .416 Rigby, and there are no discrepancies between SAAMI and C.I.P. regarding the case and chamber dimension specifications for the .416 Rigby cartridge. Maximum average pressure given by SAAMI is . Most ammunition manufacturers in the US are offering the .416 Rigby for hunting Dangerous Game and the cartridge is becoming popular once again. Performance The original ammunition for the .416 Rigby used cordite as a propellant, firing a full metal jacket or soft-point round nose bullet weighing at generating . The current standard using smokeless powder is a bullet at , generating . This is the standard to which Federal, Hornady, Nosler, and Winchester load their ammunition. In its original configuration, the .416 Rigby compares favorably with its close counterparts of the era: the .404 Jeffery, and .425 Westley Richards. The .416 Rigby loaded with the bullet at as the Hornady's DGS and DGX ammunition are, has an MPBR of . The cartridge is capable of producing over of energy at a range of . In comparison, the typical .458 Winchester Magnum