Lots of variables at play in cold weather.
My experience has taught me there hasn't been a tonne of noticeable zero shift at 100yds. That doesn't mean that there won't be a noticeable difference further out and you should definitely shoot some further distance to confirm
Is the ammo fresh out of the truck or as it been sitting in -30 on stand for a couple hours? Cold powder means lower speed in your bullets and that too will translate down range.
Cold weather and heavier clothing. Are you interrupting some of the principles of marksmanship as you fight with your heavy jacket/overalls and force your natural point of aim?
All the more reason to shoot more and learn more.
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