Uses the same rim size of 0.476 so it can fit in a standard 30-06 bolt and action. The round was developed at the start of the 1900's for the Germans in Africa that couldn't afford the 375 rifles for hunting. Kind of like the 6.5x55 and 7x57 with killing efficiency. I have one and that is my moose and bigger gun. Dropped a moose with one several years ago. Do a search on line for it.
