"404 Dakota"
The 404 Dakota is one of seven Proprietary Cartridges developed by Don Allen, the founder of Dakota Arms in
Sturgis, South Dakota.  
One of the newer Dakota Cartrid.404es, these come with a .423", 400 grain Hornady Round Jacketed Soft Point
Although shorter then the 416 Rigby it out preforms the Rigby , with 5,115 foot pounds of  energy and  a velocity of
2,500 feet per second.