When your Trojan was built circa 1917, the standard chambering was 2 5/8 inch in 12-gauge, intended for a 2 3/4 inch shell, 2 7/16 inch in 16-gauge intended for the 2 9/16 inch shell, and 2 3/8 inch in 20-gauge intended for the 2 1/2 inch shell. I have a 1930-vintage VH-Grade 20-gauge that has the 2 3/8 inch chamber for the 2 1/2 inch shell. Even the Remington-era specification sheets shown on pages 164 to 169 of The Parker Story, call for a chamber 1/8-inch shorter than the shell for which it is intended. By then the 16- and 20-gauge guns were being chambered 2 5/8 inch intended for the 2 3/4 inch shell.
Impossible to say what may have been done to the chambers of a gun since it was built 95 years ago.
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Threaded Mode