It was -2 f this morning and it gets a LOT colder up here on a regular basis. I routinely shoot at temps well below -20 with all sorts of firearms including a Ruger 10/22, my M1A and my Garand and the best stuff I've found is called LAW( lubricant, arctic weather) The cans I have now are made by Castrol special lubricants division. My bolt gun loves it too. Hunting coyotes for pelts is quite the experience in winter. I bought the case I have now at a surplus store and it should last me and my son a lifetime. I have no idea where to find more.