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==12.17×42mm RF and its subvariety the 12.17×44mm RF== The 12.17×42mm RF rimfire round was developed by a joint Swedish-Norwegian arms commission, and was adopted by the armed forces of both Sweden and Norway in 1867. It was used in the M1867 Remington rolling-block rifles adopted as new standard rifles by the armed forces of Sweden and Norway the same year. Large numbers of older rifles, both Swedish muzzle-loading Model 1860 and breech-loading Model 1864 and Norwegian breech-loading Kammerlader rifles of various models were also converted to rolling block rifles, chambered for the new standard round. A lengthened version of the round, the 12.17×44mm 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. In Swedish service the standard cartridge used a lead projectile (shaped like a Minié ball) weighing 24 g (370 gr). The muzzle velocity fired through a 955mm (37.6 in) rifle barrel was 386 m/s (1,266 ft/s), with a muzzle energy of 1,788 J (1,319 ft/lbf).〔http://www.digitaltmuseum.se/things/gevar-m-1867-74/S-AM/AM.025775?pos=194〕 Fired through a 460mm (18.11 in) carbine barrel the muzzle velocity was 340 m/s (1,115 ft/s), with a muzzle energy of 1,387 J (1,023 ft/lbf).〔http://www.digitaltmuseum.se/things/karbin-m-1870/S-AM/AM.026111?pos=10〕 In Norwegian service early rounds had a cast lead projectile weighting 5.85 kvintin (22.8 g/352 gr) and 1 kvintin (3.89 g/60 gr) of gunpowder. Later rounds had a pressed lead projectile weighting 6 kvintin (23.4 g/361 gr) and the gunpowder load was increased to 1.05 kvintin (4.09 g/63 gr). There was also a blank round - an ordinary cartridge case loaded with 54 gr (3.50 g) of gunpowder and closed with a cardboard or cork disc. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「12.17×42mm RF」の詳細全文を読む スポンサード リンク
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