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Mauser, Oberndorf a.N., marked the barrel dimensions of commercial rifles on the underside in one line: Land diameter, groove diameter, twist length, all in mm. Besides, they marked the old fashioned gauge numbers. Some examples: 459 = 5.5 mm, on all prewar .22 smallbores 278 = 6.5 mm 222.5 = 7 mm 172.28 = 7.62 mm, on 8 mm barrels 118.35 = 8.64 mm, 9 mm and some 9.3 mm barrels 108.49 = 8.89 mm, on 9.3 mm barrels 72.68 = 10.16 mm, 10.75 and .404 barrels These gauge numbers were apparently taken over from the British proofhouses, as 172.28 is .300”, the next larger 156.14 is .310”, 141.95 is .320” and so on. There were no intermediate steps. |