Scopes are just fogging devices in the cold. The Soviets solved this by holding the head a bit further back and cocked, and you naturally breath away from the scopes, as well other Soviet scopes have eye cups that seal the rear lens to protect them from such. Reloading is not common, but not uncommon. My wifes older brothers reload, and help her with such, when needed. Open sight get snowed over at worst , usually. When shooting down hill, as we prefer, theres no hold over and shooting with the sight on 150 kinda takes care of a long range shots from above, that's why we have a favored place called "on High"