My grandfather had an Iver Johnson revolver in the Alaskan Gold Rush.
So we bought a bunch of those at gun shows.
I bought some books by Goforth on Iver Johnsons.

Then we started buying beat up 410 break action shotguns and restoring them.

I have shot double charge 454 Casull loads in a Stevens 410, but the OAL was too long to fit in a 454 Revolver. Some complain that the 410 is designed for 13,500 psi and the 454 for 65,000 psi.
I respond... the steel in the shotgun does not know that. It is too thick.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps