In theory, at the time of their introduction, the Trojan would have come with 2 5/8 inch chambers in 12-gauge, intended for 2 3/4 inch shells. In 16-gauge they would have had 2 7/16 inch chambers intended for 2 9/16 inch shells and in 20-gauge 2 3/8 inch chambers intended for 2 1/2 inch shells.
By the Remington era specification sheets all three gauges would have had 2 5/8 inch chambers intended for 2 3/4 inch shells.
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