Chamber lengths on 12 ga. Trojan

[Harold Pickens]

Opening up a chamber just makes sense to me, especially on a shooter.
One of the reasons I like Utica Foxes is that the later had 2 3/4" chambers and generally better stock dimensions.

[Bill Murphy]

Pete, in 1972, Del Gregos sent me an invoice for working on my 28 including a small charge for lengthening the chambers to 2 3/4". Years later, I measured the bores and chambers. You guessed it, 2 1/2". I had shot thousands of rounds through that gun over the years.

[Drew Hause]

Dave likely posted this previously, which should end the debate regarding 12g chambers and loads; from the 1914 catalog

12g (2 5/8" chambers) "for 2 3/4-inch shells"



Using 2 3/4" 20g shells in chambers shorter than 2 1/2" is an entirely different issue.

[edgarspencer]

The front corner of the forcing cone is where the pressures are highest. .090" is considered the minimum safe thickness at that spot.
Lengthening a 2 7/16" chamber to 2 3/4" (16ga.) probably took that wall thickness down. A gunsmith with a chamber reamer is only as competent as the advise he gives you.
Shooting one brand, which gives you some issues, in opening the gun can be the result of a lot of things, the least of which is the 2 3/4" shell.