Lyman 6W to Winchester 70B|Winchester Sights|Forum|Winchester Collector

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