I have a ‘58 vintage Superposed Magnum 12 choked full and modified. Is it problematic to use non toxic shot in it?
You definitely don’t want to shoot steel through it. I would go on the website of the shot manufacturer and find out what they recommend. The full choke could be a problem. Some guys are forced to shoot steel and report no problems unless from a full choke, then it bulges the barrel. I don’t know about the other specialty shot.
