That makes sense-as the M12's in 16 and 20 gauge, aprox. after 1930-something, had 2 & 3/4" chambering- The M12 28 gauge had 2 & 7/8" chambering- the front of the ejection port would most likely
be "re-radiused" to allow a spent 2&7/8" length hull to clear--
Roger Rule's great book on the M70 is a "bible" of data and good detailed photos. Ditto for both the Madis and Riffle books on "The Perfect Repeater" regardless of gauge and configuration. RWTF
Last edited by Run With The Fox; 03/03/19 05:08 PM.
