What I can say, being from up north and having experienced this because I worked at a fly-in fishing and hunting camp, is no, there's no right in Canada to a specific firearm. The law is well settled. Once it's prohibited, there is no ability to use that for self-defence or any other purpose in the wild.
What I can say is that there are sometimes authorizations to carry that are provided under the authority of the Firearms Act. I could possibly turn to my colleague Rachel, and perhaps she can....