Maybe the temps just don't get cold enough here to experience that. I've traveled back and forth to islands in the Mississippi River in boats with an uncased rifle where we had to break ice to get to the shore. I've hunted where rain turned into sleet, then snow and never had an issue.
I do use gun grease in my trigger group and firing pin, so maybe that has prevented it.
I've got an A-bolt and an X-Bolt that will shoot .600's and do it with a variety of ammo.
