gunshow loophole is bullshit, if you're a non dealer you have the right to sell your firearm to a qualified buyer depending on your state law FTF, either in a parking lot, your driveway, club, or gun show.
Federal law prohibits you from buying a firearm from out of state, if you're traveling out of state and going to a gun show, contact your favorite FFL, get a couple signed copies of his FFL, buy the gun, pay for shipping, and you'll have to do the transfer in your home state from the dealer the gun was shipped to. Or you can put a small deposit down, get back home, have your dealer send the FFL to the dealer that's out of state. You wont be able to take it with you. There's no federal ban on buying a long arm from a bordering state, but state laws may kick in and restrict that. Best to google on your home state for gun laws, they'll be in the General Statutes. NRA website has state and federal laws listed there as well but laws change every day so just use the NRA site as a reference.