I suspect there are more Model 12 28-gauges with 2 7/8-inch chambers than 2 3/4-inch. The 2 7/8-inch was the length of the 28-gauge Winchester Super-Speed and Western Super-X shells through the November 3, 1948, catalogs. In the May 4, 1949, catalogs they are listed as 2 3/4-inch length. The January 24, 1955, Winchester catalog still lists the 28-gauge Model 12 Skeet Gun as being chambered for 2 7/8-inch shells. The September 30, 1955, Winchester catalog lists all gauges of the Model 12 Skeet Gun as being chambered for 2 3/4-inch shells. 1959 was the last year the 28-gauge Model 12 Skeet Gun was offered. From 1960 to the end only 12-and 20-gauges were offered with the New Winchester Ventilated Rib (aka three-pin).
A few pieces of pre-war Winchester paper list the availability of the 2 1/2-inch chambering for the 28-gauge Model 12, but I've never seen one so chambered/marked.
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Threaded Mode