There was Wild West Guns and another I can't remember..Talk is once the Buffalo guys get the big .500 S&W fixed right in there levergun,they will make the 454 Casull in a levergun.
Here is one prototype..I think it was Wild West guns..Don't quote me but it is the action that fails in a levergun with a SAAMI of 65,000 PSI.
Jayco
Wow. That thing looks like it's built like a bank vault. Impressive.
"For joy of knowing what may not be known we take the golden road to Samarkand." James Elroy Flecker