Federal law prohibits it , unless you deliver it to the conductor, under Title 18 Part 1 Chapter 44 Section 922 subsection e. Nothing says they have to accept it however and it only applies to interstate not intrastate transport.What type of violation is it if you do?
(e) It shall be unlawful for any person knowingly to deliver or cause to be delivered to any common or contract carrier for transportation or shipment in interstate or foreign commerce, to persons other than licensed importers, licensed manufacturers, licensed dealers, or licensed collectors, any package or other container in which there is any firearm or ammunition without written notice to the carrier that such firearm or ammunition is being transported or shipped; except that any passenger who owns or legally possesses a firearm or ammunition being transported aboard any common or contract carrier for movement with the passenger in interstate or foreign commerce may deliver said firearm or ammunition into the custody of the pilot, captain, conductor or operator of such common or contract carrier for the duration of the trip without violating any of the provisions of this chapter. No common or contract carrier shall require or cause any label, tag, or other written notice to be placed on the outside of any package, luggage, or other container that such package, luggage, or other container contains a firearm.
Yes a muzzleloader is considered a firearm. The only difference is that it has to be packed and primed in order to be considered loaded.I would hate to be the test case, but is a muzzleloader revolver considered a firearm by law? You could use a CO2 de charger to unload for the trip back.