Glad to hear someone else is out shooting in the cold! It's required here in Alaska!
Pete's advice on the hot primer is right on. Predator rifles at -20 and below function way better with magnum primers, even in the smaller cases like 222. Powder doesn't seem to make as much difference as the primer. I would be interested in hearing how much difference you find the powder choice makes with the shotgun. I haven't experienced problems with my shotgun, but probably haven't had the shells out of my pocket long enough to get really cold.
Ron
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