The length of an unfired live shell is not the way to determine its suitability for a particular gun. The advertised length of a shell by the manufacturer is for the length of the shell after it has been fired... which is often a good quarter-inch or more than the unfired shell. Dropping a 2 3/4” shell into my 1898 DH 12 with 2 9/16” chambers is no problem at all, but after firing the mouth of the shell is pinched and torn to a fine edge.
Your Trojan 20 will be fine shooting ‘reasonable’ 2 3/4” shells and the only thing you might notice is a tiny bit more recoil... if at all.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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