I can assure you that IMR SR7625 does not perform well in 1100-1200fps 1oz 12ga handloads in AA hulls using WW209 primers in the cold if it's -10deg F or colder. Using hulls that have more than 3-4 reloads can make it worse. Upping the shot to 1-1/8oz would likely help. I have to be very cautious when shooting at -25F; I blow clear and look down the bbls every time, regardless of how the shots sounded. I have not participated in the annual -40F shoot up here but would use factory ammunition if I did and keep it inside a parka somehow, not on my belt in a normal carrier.
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