Would you use them ?

[Dean Romig]

As chambers are lengthened the wall thickness at the juncture of the chamber and forcing cone becomes an issue of primary concern because as the chamber is lengthened you encroach on the tapered or sloped exterrior of the barrel.






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[todd allen]

Originally Posted by Dean Romig

As chambers are lengthened the wall thickness at the juncture of the chamber and forcing cone becomes an issue of primary concern because as the chamber is lengthened you encroach on the tapered or sloped exterrior of the barrel.

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I crossed this bridge years ago with an old 2 1/2" chambered H&H SLE, that I purchased from Briley's, btw. They said it would not be advisable to lengthen the chambers, but the shoulders could be tapered from the forcing cone to the bore.
So, that is what we did.

[Harry Collins]

In the early issues of Double Gun Journal (I'm going on memory here friends) John Brindle wrote some articles titled "Nitro for Black". His conclusion was that if you stay at or under 8,000 psi you are good to go with modern powders.

[Harry Collins]

The VH that Sherman Bell blew up Took some 31,400 psi before it let go at the breech where the extractor pin and the dolls head screw almost connect. If I recall correctly I had those forcing cones lengthened. I know I wanted it done, but I can't recall it the gunsmith talked me out of it or not. Today I will not change chokes, mess with the chambers or forcing cones on a Parker.

[Bruce Day]

So you make the walls of the chamber thinner but it does not make the walls weaker?

[Kenneth Jones (Kenny)]

Would lengthened chambers void the proof?

[Richard Flanders]

Thanks for that question Bruce. Lengthening the forcing cones without weakening the chamber area defies the laws of physics big time.

[todd allen]

Originally Posted by Richard Flanders

Thanks for that question Bruce. Lengthening the forcing cones without weakening the chamber area defies the laws of physics big time.

I'm just going with what Chuck Webb from Briley's told me. I would guess that he knows a little bit about shotgun barrel internals.

[Bruce Day]

Here is a Parker published loading table showing drams in black powder. Just substitute drams black to drams equivalent in smokeless. Unless you have hogged out barrels or wrecked stocks.