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First….8x57mm JS There are some variables to handloading the 8×57 JS, the first being it’s name. Sometimes it is referred to the 7.9x57mm, or 7.92×57, or 8mm Mauser, or 8x57mm JS Mauser, or the 8x57mm IS Mauser. They are all the same. The cartridge is a derivative of the German Military Commission and is not…

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