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Commercial American 8X57mm ammo is designed to work at the lower pressures of the M88 Mauser rifle that "may" still have the .318 bore diameter. Not only is that particular model mauser comparatively weak, but standard 8mm bullet diameter is .323. American ammo manufacturers load a very soft/thin jacketed bullet precisely because it might be fired in one of these. While not recommended, firing one commercial American 8mm mauser cartridge in a well made modern .30-06 rifle should not damage the rifle