Originally Posted By: 1cdog
Thank you Blue Grouse & Toby Barclay for straightening out misinformation posted early on in this thread regarding MWT and Proof House.

I owned a gun a couple of years ago that had just passed London Proof with a MWT of .018.


I don't believe London proof has existed for some time. And Birmingham proof has been increased considerably. Two proof rounds are fired in each barrel.
Dig had an article in DGJ that pointed out a model of Cogswell and Harrison was gathering a reputation for failing reproof, the article had photos of an old gun with a cracked frame.
I suspect that many of these same guns would be just fine if used with the loads they were designed for, but, can offer no proof.
The only double guns I ever had that had .030 of muzzle wall out to the 9" from breech measurement were Darnes. My Italian guns left the factory at about .025 in that area of measure.
I'm not interested in doubles at .020 or less, in the same area. I use my guns.



Best,
Ted