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The 8x68mm S rebated rim bottlenecked centerfire rifle cartridge (the S denoting it is intended for 8.2 mm (.323 in) groove diameter bullets) and its necked down sister cartridge the 6.5x68mm (no S, or other modifier required) were developed in the 1930s by ''Mr. Schüler'' of 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 8x68mm S and 6.5x68mm 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〔(RWS )〕 (''Rheinisch-Westfälische Sprengstoff-Fabriken'') 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: * 8×68mm S (1939) * 6.5×68mm (1939) * .375 Hölderlin (2007) * 8.5×68mm 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 8×68mm S cartridges, since the M98 internal magazine boxes feature an internal magazine length of and 8×68mm S cartridge cases have a significantly larger diameter than 8×57mm IS service cartridges. In properly adapted standard military Gewehr 98 or Karabiner 98k service rifles the large 8×68mm S 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 case length were too long to fit in standard sized Mauser 98 bolt action rifles makes the shorter 8x68mm S, 6.5x68mm and .375 Hölderlin interesting chambering options. World War II spoiled the commercial introduction and spread of the 8×68mm S amongst German hunters. The cartridge became due to its high performance and flat trajectory popular after World War II when German hunters were allowed again to own and hunt with full bore rifles. The 8x68mm S performance was also made available to hunters who previously had problems with handling magnum cartridge recoil and had stepped down to less powerful but for German conditions adequate medium cartridges like the 8×57mm IS, 7×64mm (Brenneke) or .30-06 Springfield (also known as the 7.62×63mm in metric countries). This was accomplished by fitting an efficient muzzle brake to significantly reduce the amount of recoil for recoil sensitive shooters. With the help of a muzzle brake the 8×68mm 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「8×68mm S」の詳細全文を読む スポンサード リンク
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