Chamber / Forcing cone
 

Please excuse me as I'm new. Would it really hurt the value of a Parker Trojan with a 2.5" chamber to lengthen the chamber to 2 3/4 and give it long forcing cones?

If it's a 12 gauge probably not, unless it's in really nice condition. You wouldn't need to lengthen the forcing cones beyond the approximate 3/4" that were about the standard length. Incidentally, 2 5/8" chambers was the length for 2 3/4" shells and the 3/4" cone beyond that. The shell opens 1/8" into the beginning of the cone giving it a better gas seal.... or at least that was the school of thought when paper shells and fiber wads were standard.





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I would think so, especially if the gun is otherwise in good condition. With the availability of 2.5” ammo there really isn’t any reason to lengthen chambers and cones.

Best,

Jay

With all the knowledge we have gained over the recent years on this issue, and with the great ammo available, I don't believe it's necessary to alter an original gun. Whether it changes the value negligibly or not seems a distance second question to keeping the gun in original condition. Then, there's the issue of getting someone truly competent to do the job.

An absolute waste of money to drill metal out of a perfectly good shotgun barrel, from either end.

are you sure the chamber is 2 1/2 it s probably eihter 2 5/8 or 2 3/4....if its a steel barrel gun i bet its longer than 2 1/2 inches...charlie

Are you sure you need to lengthen the chambers when all you get is a pressure reduction of about 300 psi?

If it was intended for the 2 1/2 inch paper 20-gauge shells of the day it is going to be about 2 3/8 inch. That is what my 1930 vintage Parker Bros. VH-Grade is and a couple of my 20-gauge Ansley H. Fox doubles.

Wayne, what problem are you trying to correct by lengthening the forcing cones? Removing material without a sound reason makes no sense.

My understanding is that lengthening forcing cones takes a gun out of proof. Tapering forcing cones, does not. Not saying to do one thing or the other. That's was I've been told by Briliey's, regarding an old H&H that I had acquired.
That said, (especially when dealing with otherwise original Parkers) my position is; do no harm.