Ron,
Normally I use 2 1/2" RST or hand-loaded shells in my Trojan 16 but a sixteen gauge on a 1-frame like your Trojan will easily digest standard 2 3/4" shells. However, I would never advocate the use of 2 3/4" shells in a 0-frame sixteen or Damascus gun with 2 1/2" or 2 9/16" chambers. The only difference between these 2 3/4" and 2 1/2" shells will be the possibility of a bit more perceived recoil but I don't notice it in my Trojan 16, just don't use heavy or magnum loads in it.
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