Chamber Thickness
I just took the micrometer to the chamber wall of a 1 1/2 frame DH which is a little under 7 pounds. It measured .190 inches. There must be a lot of lightening holes in those 6 and 6 1/2 pound English twelves if they have a .287 thickness. I think the diagram is in error; adding .080 for the difference in bore diameter and chamber diameter makes it a little closer, but not quite as thick.
A three frame ten is .245 at the breech.
Best, Austin
Added; Bill is correct, a flat or dovetail is cut to join the barrels at the breech removing about 1/8 inch from the breech width.
I just measured a three frame 12 ga barrel. The chamber wall is .265 inch thick. The barrels are stamped 5 12
Last edited by Austin W Hogan; 10-29-2010 at 05:10 PM..
Reason: Add three frame barrel and comment
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