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Chamber / Forcing cone
Unread 11-05-2019, 06:14 PM   #1
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Wayne Beals
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Default 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?
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Unread 11-05-2019, 07:18 PM   #2
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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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Unread 11-05-2019, 07:20 PM   #3
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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.

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Jay
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Unread 11-07-2019, 09:49 AM   #4
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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.
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Unread 11-07-2019, 05:45 PM   #5
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An absolute waste of money to drill metal out of a perfectly good shotgun barrel, from either end.
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Unread 11-07-2019, 06:09 PM   #6
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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
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Unread 11-07-2019, 07:07 PM   #7
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Are you sure you need to lengthen the chambers when all you get is a pressure reduction of about 300 psi?
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Unread 11-07-2019, 07:07 PM   #8
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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.
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Unread 11-08-2019, 02:02 PM   #9
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Wayne, what problem are you trying to correct by lengthening the forcing cones? Removing material without a sound reason makes no sense.
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Unread 11-08-2019, 02:47 PM   #10
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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.
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