An easier question to answer is: How high is up? As can be seen, there's no common ground on what is an "antique." In Calif. where I live, the State ignores Federal law and says if a gun can chamber any ammo commercially available it's not an antique. Last year an exhibitor friend of mine was arrested at a CA. gun show having sold a .38CF 1880s Iver Johnson revolver to a Dep't of Justice convicted felon decoy. The decoy was able to buy modern .38S&W at the show, so my friend was arrested and charged with violating state law. He went to trial and the Judge threw out the case based on entrapment plus the fact the modern ammo. was not black powder that the gun was made to use, however it cost my friend $8,000 in legal fees. The moral is: If you are buying or selling a cartridge gun, do the paper work to be safe unless you are willing to take the risk of a set up. Ed.