the .308 norma magnum (7.62×65mmbr) cartridge was created by nils kvale at norma, sweden. like the larger .358 norma magnum it is based on the .300 h&h magnum. the length of the case is the longest that would fit in a standard mauser action. while it appeared to have a bright future initially, it was soon superseded in popularity by the .300 winchester magnum. the first, and one of the few, manufacturers to offer rifles in .308 norma magnum was schultz & larsen of denmark and they still are.