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The 6.5x68mm rebated rim bottlenecked centerfire rifle cartridge (also known as the 6.5x68mm RWS, 6.5x68mm Schüler or the 6.5x68mm Von Hofe Express) and its sister cartridge the 8x68mm S were developed in the 1930s by ''Mr. Schüler'' from the ''August Schüler Waffenfabrik, Suhl, Germany'' as magnum hunting cartridges that would just fit and function in standard sized Mauser 98 bolt action rifles. This is one of the early examples where a de novo rifle cartridge (the 6.5x68mm and 8x68mm S have no other cartridge as parent case) was developed by a gunsmith to fit a specific popular and widespread type of rifle. == History == The German ammunition manufacturer (RWS ) (Rheinisch-Westfälischen Sprengstoff fabrik) introduced both cartridges commercially in the spring of 1939. With the official certification of the .375 Hölderlin and the 8.5x68mm Fanzoj this German 68 mm "family" of magnum rifle cartridges that all share the same basic cartridge case got expanded in the 21st century. The cartridges in this German 68 mm cartridge "family" are, in the order of development: * 8x68mm S (1939) * 6.5x68mm (1939) * .375 Hölderlin (2007) * 8.5x68mm Fanzoj (2012) The M 98 bolt actions and magazine boxes of standard military Mauser 98 rifles have to be adapted by a competent gunsmith to function properly with these magnum cartridges since the cases are longer and have a larger diameter than the 8x57mm service cartridges. In properly adapted standard military Gewehr 98 or Karabiner 98k service rifles the large 6.5x68mm cartridges are, however, praised for very smooth and reliable feeding. The widespread availability of standard size Mauser 98 rifles and the fact that the .375 H&H Magnum cartridge and its necked down version the .300 H&H Magnum with approximately 72.4 mm case length were too long to fit in standard sized Mauser 98 bolt action rifles makes the shorter 6.5x68mm, 8x68mm S and .375 Hölderlin interesting chambering options. World War II spoiled the commercial introduction and spread of the 6.5x68mm. The cartridge became popular after World War II due to its high performance and flat trajectory, when German hunters were allowed again to own and hunt with full bore rifles. The 6.5x68mm's performance also made it that hunters who had problems with handling magnum cartridge recoil stepped down to less powerful but adequate medium cartridges like the 6.5x57mm, 7.92x57 mm Mauser, 7x64mm (Brenneke) or .30-06 Springfield (also known as the 7.62x63mm in metric countries). Recoil sensitive shooters can fit an efficient muzzle brake to significantly reduce the amount of recoil. With the help of a muzzle brake, the 6.5x68mm's recoil is reduced to tolerable levels. 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「6.5×68mm」の詳細全文を読む スポンサード リンク
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