It's not legal to have rounds in your rifle while in a vehicle in Oregon either.
mind citing the ORS? i've found absolutely nothing in the ORS that prohibits loaded rifles in a vehicle- and always have a loaded/chambered carbine in the truck with me, hunting or not.
i've also never had it made an issue during any of the 5 or 6 traffic stops where i've pointed the weapon out to the officer- to my surprise (legal or not).