Gents- I don't MEAN to sound surly- but PLEASE don't offer legal advice if you don't know. Transport of a handgun across a state line is NOT a Federal crime in and of itself. Law of the US is attached as a c&p from US Code. You may also SHIP your own firearms to yourself (UPS or FedX) but handguns are really expensive to ship. LONG guns may be MAILED to yourself- but only an 01 FFL dealer, certain Fed officials, or a licensed mfgr can mail a handgun. But you can also case the unloaded weapon, place in the trunk, lock it. As long as possession of that firearm is legal at both ends of your trip, you are good to go. attachment:
Title 18, US Code
Sec. 926A. Interstate transportation of firearms
Notwithstanding any other provision of any law or any rule or regulation of a State or any political subdivision thereof, any person who is not otherwise prohibited by this chapter from transporting, shipping, or receiving a firearm shall be entitled to transport a firearm for any lawful purpose from any place where he may lawfully possess and carry such firearm to any other place where he may lawfully possess and carry such firearm if, during such transportation the firearm is unloaded, and neither the firearm nor any ammunition being transported is readily accessible or is directly accessible from the passenger compartment of such transporting vehicle: Provided, That in the case of a vehicle without a compartment separate from the driver's compartment the firearm or ammunition shall be contained in a locked container other than the glove compartment or console.