We've had this discussion before, but I'd like to raise the issue again, as I will be going after caribou in a week or two and it will probably be around zero +/-. I've hunted ptarmigan in the cold before and had hang fire due to thick oil on the firing pin. Scary! Missed shots! My uncle in law told me to strip off all oil and use kerosene when it got cold. I'd hate to have to strip my rifle action totally apart to get the oil off, so here's my question to you far northers: what spray-on oil do you use in the winter so that your rifle functions in the cold?