you will need to stay away from water based lubes and wipes, like murphy soap oil, etc.. the best is bear oil, next is tc lube or bore butter i think its called.. it will just get harder in the cold ,not freeze. i keep mine in my shirt pocket... ive hunted ducks with shotgun to 20 below.. reloading at below +10 degrees sepparates the men from the boys.. be carefull at -20 you can freeze your hands.. load for couple seconds, jamb your hands down into your groin, warm up and load for couple seconds, for fastest loading.. it can take what seems like eternity to load at 20 below. brass measures, gun barrels, etc can caouse frostbite. once you fire i would load immediatly as fouling cools and dries, it gets like cement.. if you cant load becouse of fouling, you can wipe with pure denatured alcohol if needed, i like to mix with murphy soap oil but it will need to be tested at your temp your hunting so it dont freeze.. it also depends on ball tightness, patch thickness, lube type, and humidity or lack of.. there is very little if any humidity at -20.. it needs to be said pure alcohol on your hands at 20 below is probably dangerous.. one time duck hunting at 20 below my wet WOOL pants touched a steel culvert.. (wool will still keep you warm if it is damp)... i thought i was going to have to cut them free as they froze rock hard instantly to the culvert. so your playing with fire, use common sence..i trapped beaver when i was younger and would fall thru the ice, in all types of weather.. all my clothes was pure wool.the old ww2 military pants, shirt,were the best..and a filson mackinaw coat.. you have to take them off wring them out and put them back on, and your fine even at -20.. probably sounds pretty crazy to those that havent been there.. all this new fancy mixed blends of clothing are light, neat looking and stylish but if they get wet, youll probably freeze to death if youve got very far to go.. dave