I hunted in BC last year for Moose and drove from Arizona. Long drive but I wanted to bring all the meat home. I used Canyon Coolers and they’re some of the best coolers out there. I used ice until crossing the border, then put dry ice above the meat - protected from touching the meat with towels. My processor was concerned about the temperature of the meat until he tested it, all the meat was in mid 30’s and in excellent condition. I crossed the border at Roosville just north of Kalispell, MT. Easy to cross into Canada with a rifle, had the firearm import form filled out and probably took 20 minutes to clear. Coming back into U.S was easy also, just make sure you have the 4457 form for any firearm before leaving the U.S. I cut the antlers/skull cap off in Canada and customs officer was concerned about some tissue on the skull and after an inspection from Agriculture inspector they said it was ok as I had cleaned the inside of skull of all brain matter. Will definitely clean it a little better next time. There are several threads here regarding taking a firearm into Canada if you have a DUI or any other conviction. I have a clean record so no issues. Long drive but a great experience that I will do again.