One issue with the .585 diameter cartridges has to do with the thickness of the barrel between the threads and the chamber. Many 416 Rigby's have been built on M70's and 98 type Mausers. However the Rigby is loaded to very moderate pressure. Loaded to high pressure and it is possible to expand the barrel shank into the action threads and perhaps damage the action. The RUM's are on the very edge of acceptable.
Last edited by RinB; 10/01/12. Reason: spelling
