So, our guy was shooting 3-1/2" modern shells in 2-7/8" chambers with short forcing cones with no problems. Impressive indeed.... but... not me. Never. And I'd guess not anyone else with knowledge on the issue on this forum either. Hats off to the old guy for still having a left hand and two eyes and functioning hearing... I'd be curious to see a list of the barrel wall thicknesses from breech to muzzle at some interval of around 2-3 inches.
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