Just wondered, while hunting in cold weather if you kept your rifle in the cold to keep the scope from fogging up? I've never had a problem, but I doubt I've hunted in those temps. I think 13 degrees is about the coldest for me. Working is another story. Also, do you use special lube for cold temps?
I got done to 8 degrees F, IIRC. I didn't use a special lube, just the standard grease that I mix up myself. Never had an issue with Nightforce scopes fogging up in any weather.