Wall thickness is key to this. What year production is the Trojan? A lot of earlier ones were 2-5/8" chambered and many ask questions about shooting 2-3/4" shells in these guns. If yours is lengthened to 3" then it may have been lengthened a full 5/8" which may be a bit much. But if it is a later gun where it may have been 2-3/4" originally, then it was not lengthened all that much.
Chances are the gun has been shot a bit since the time of the chamber lengthening, so I would not think shooting it now would be an issue.
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B. Dudley
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