kuduae
(.400 member)
27/02/22 08:58 PM
Re: Feedback on 1910 factory Mauser sporter

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.



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