Answered my own question after some digging.
From rcmp-grc.ca
Q. Do I need authorization to transport my firearms from one location to another?
Any time you personally transport a restricted or prohibited firearm within Canada, you need an Authorization to Transport (ATT) from the Chief Firearms Officer of the province where the firearm is located or where it will be entering Canada. You do not need an ATT for firearms that are being shipped by licensed carrier or for non-restricted firearms that you are transporting yourself.
From rcmp-grc.ca
Q. Do I need authorization to transport my firearms from one location to another?
Any time you personally transport a restricted or prohibited firearm within Canada, you need an Authorization to Transport (ATT) from the Chief Firearms Officer of the province where the firearm is located or where it will be entering Canada. You do not need an ATT for firearms that are being shipped by licensed carrier or for non-restricted firearms that you are transporting yourself.