I have a friend who is getting ready to go on a Caribou hunt and he was told to prepare for 40 Below temperatures. He's taking a rifle for fear that his Mathews Z-Max couldn't perform in that temp. I e-mailed Mathews for info on this but haven't yet got a reply. Has anyone had any experience using a bow in such temperature. I remember seeing someone take a Musk-Ox with a bow in some really bad, icy situation but 40 Below is serious. What do you think?