So, it's not the airport but which airline you choose.
WestJet is usually accomodating and not too zealous about ammo weight.
AirCanada agents usually don't know what to do to find the correct forms.
Always take your bags to oversize luggage to be x-rayed while you are there to explain and show your forms otherwize they may pull the bag and you off the flight so they can get your permission to open it, you miss the flight,,,day screwed up.
All international luggage is x-rayed and most domestic so always go to oversize and you won't have the issue.