Posted by Drew Hause on January 28, 2017, 7:48 am, in reply to "Re: 10g loading data"
Wow Gary and thanks. The specs appear to be for unfinished Whitworth barrels with bore .714" with chamber AND forcing cone 3 5/16" (if the forcing cone is to be cut the standard 1/2" the chambers would be 2 13/16"). Dr Jim's book lists NO 10g post-1908 Deluxe or Premier. There were 6 10g A2s but the last was 1916; 5 Monograms so that is likely where the tubes went.
BTW found an internet post stating a fella's 10g had 3" chambers; no DOM.