A lengthened version of the round, the 12.17x44mm RF, was adopted by the Norwegian armed forces in 1871. But the two cartridges were interchangeable, and could thus be fired from the same weapons. The round, nominally known as 4 Linjers (actual bore diameter 4.1 Swedish decimal lines or 3.88 Norwegian decimal lines, that is 0.41 Swedish or 0.388 Norwegian inches), had a lead bullet 12.615mm (0.497 in) in diameter, with the diameter of the bore, measured between the lands, being 12.17mm (0.479 inches). It used a copper case.