When they turned sawed off shotguns into restricted weapons, they had to first define what a sawed off shotgun was and one of the things that defines a shotgun was having no rifling in the barrel.
So, the Judge revolver has just enough rifling in the barrel to keep it from being defined as a sawed off shotgun. Technically it is chambered for .45 Long Colt ammo but .410 shotshells just happen to chamber in it.
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