The Trojan would have originally had 2 5/8" chambers and really is not suitable nor safe for either shooting a 3" Magnum load as is nor having the chambers lengthened. If you want an old SxS to shoot 3" loads from the M21 Winchester 3" Duck, some L.C. Smith Long Range/Wildfowls or the rarer Fox HE and Ithaca NID 12g 3" Magnum would be MUCH better choices. Good Luck
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