None of the guns made during that era were INTENDED to be used with modern gun powders. Mike Hunter, I believe you are taking the above verbage out of context. The page from which it has been taken is referencing "original antique" firearms which have been modified, resulting in reclassification under the NFA. Note the illustrations where the original and modified versions are shown with explanations. If the original were not considered an "antique" by the ATF then the page would not exist detailing the change from "original antique shotgun" to "short barreled shotgun" under the NFA. In that example, the ATF says that the original is an antique even though it uses a conventional ignition system abnd utilizes modern ammo. Correct?
http://www.atf.gov/content/firearms/fire...antique-firearm
