I'm originally from Alberta, now live in the U.S. (for the last 10 years) and head back up there every year to hunt whitetails with my brother. When crossing the border all you need is the firearms declaration form filled out (don't sign it until you in front of the customs officer) and pay the fee. The guys at the border often don't even open the gun case to look in. Make sure you have the "Certification of Personal Effects Taken Abroad" form filled out by on the U.S. side and signed by a U.S. customs officer before you leave so when you come back into the U.S., you can bring your rifle back in with you without any hassle. Removing the bolt is not necessary.
