Old shotguns
There are some companies that manufacture shotshells with less than 7,000 psi pressure, most of them can be found on the web by a search.
Even these shells are not safe if the barrel has mechanical defects such as corrosion from corrosive primers in the layers.
A source for inexpensive chamber adapters is Numrich Gun Parts.
It would likely be a better route to just hang it on the wall and buy a new cowboy style shotgun if you want thatstyle.
Don
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