I can not say for sure what the State laws are in the placed you wish to pass though, but a muzzleloader, unloaded, and in a case, out of reach of all passengers of a moving vehicle is normally not a violation of law. Of course these new domestic violence laws, terrorist laws, etc.. might have an impact on it, but I would "suspect" if you are a law abiding citizen with a clean record, there should be no problem.