I think the guy who "firmed it up" is nuts. He probably just peened the lugs to make it feel tighter, he sure didn't make the action or especially the barrels any stronger.
I got cured of shooting the old built up barrels by living next door to the area repair gunsmith. He had a hammer shotgun hanging on the wall with a plug about 2 inches long blown out of the left barrel... about where your left hand would be.
Black powder would be less dangerous than the lightest nitro, if you just must.
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