Miller, I recall reading those tests that Buck Hamlin did with the pitted L.C. Smith Damascus barrels in the LACA newsletter. I think he actually did eventually succeed in blowing up the barrels with what he called "Nuclear Loads", but it was only after reaching a point where the gun was blowing itself open at every shot. I'm not sure just how that occurred in a rotary bolted L. C. Smith, but the pressures had to be at least as high as Sherman Bell was reaching when his barrels finally let loose.
All the same, I think it should be a felony, punishable by hanging, to lengthen the chambers on vintage doubles. Just my opinion, but proper length shells are readily available, and modern magnum shotguns are just as available should the need arise. There is no need to turn nice original vintage cars into street rods either.
