I've read some articles from those -50 to -70 hunts!!! It will certainly be a tremendous strain for both the hunter and his equipment. I've read where you couldn't bring your bow inside the tent at night because the condensation would cause it to freeze and shatter the next day! Simple, solid designs for every accessory is the key. I know I have seen a handful of folks on the forums that have hunted Musk Ox and could no doubt offer some great advice. I know a couple of these guys are found in the Bowhunting forum on Archerytalk.com. Best of luck to ya. That would be an awesome prehistoric trophy!