Without appearing to condone the shooting of such thin-walled guns, I will say that I have an 1893 16 ga. 0-frame GH(e) with Damascus barrels that measure, at the front of the chamber where the forcing cones begin, .066" and .064" that I used to shoot for years as my "go to" grouse gun.
I have the letter from Oscar Gaddy when I sent him the barrels for his inspection where he states they are "probably okay to shoot using light loads of 7,500 p.s.i. or less." and he's the one who provided these measurements for me.
Again, I do NOT condone anyone else shooting any gun with such measurements.
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