So the good news is I've pretty much figured out how to bring guns into the USA and back home legally .
As most things gun related there are the rules and 'self interpretation ' of the rules. Example the ATF doesn't require me as a Canadian to need an invitation for a sanctioned shooting event or a hunting licence. The reality is having one or the other will make life easier at border crossing. I have an ATF number I can ask the border guard to call but reality is get a state hunting licence.It doesn't even have to be from the state I'll be visiting
Washington state crossing want to only see a proper invite from sanction shooting event only so will not be crossing through Washington but through Idaho.
So the good news is my permit is good for one year from date of issue. While I have to list everything I might bring in, I'm not obliged to bring in everything on my list(rifles,shotguns and pistols are good to go but no SBR).
Same with ammo but also have to list caliber,brands separately.Example can't simply say 12ga but list each brand and specific amount.
Still waiting to get a couple rulings( I want written confirmation) Can I bring back my used brass? also protocol for a lower with multiple uppers(the lower is the only registered part)
So need to figure out which state has the least hoops for out of state hunting licence and submit that and ATF paperwork beginning of new year
Still trying to figure a way to legally keep firearms in the USA if things go sideways New Zealand style. So far post election the anti gun thing isn't the government's priority.