


11:33 am
November 5, 2014

Hi Begger-
Roger Rule's book says the Win 70B was used on the 375 H&H Magnum C-1 contour barrels from 1953-63. In my survey to date I have about 210 M70 375 Magnum serial numbers recorded. Based on what I've seen, the changeover from 6W to 70B happened fairly abruptly around the 300-310 thousand serial number range (1954). So we're pretty close...
Hope this helps,
Lou
WACA 9519; Studying Pre-64 Model 70 Winchesters
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