I was in Sask. a 7 years ago. Have to register your gun at the boarder (have filled out before entry), allowed a case of shells, more shells after that can be charged duty (again 7 years ago), passport, and to bring back your gun to the U.S. must have certificate of reregistration customs (shows your not a gun smuggler and must be done before going into Canada).
Order your license online and mailed to your house. Must get a stamp which can be purchased at a Canada post office and anyone you know can purchase that and to give to you later. Birds must have feathered wing attached, possesion limits are a must, and to bring them to the U.S. have to declare them by filling out paper work, and can be asked to show them for a count by border patrol. Canada drive with you lights on 24/7, I think it's the law.
School yourself on the game laws and gun laws most likely a few other things to do. Dogs need paper work as well. Transport gun keep in case and behind the front seat. Basically just use good common sense and don't try to cheat with loop holes even on private land.
Please understand I don't know the laws but just giving you some friendly help on what to expect for your trip up north.
Are you going to freelance? I want to go but can't find anyone who wants to. Once I tell the check list to my friends they fold up like a head shot.

Good luck!