Balistic Products had cautioned me about the following load that they provided the recipe for.....that it would not do very well in cold weather:

12 ga. 2-3/4 WAA hull
W209 primer
W540 - 34.1 gr.
Balistic Prod. BP12/BPGS + 20 ga. felt in bottom of plastic wad
1-1/4 oz. #5 nickel-plate shot
Tyvek over-card
8-star crimp

Yes, the colder it gets, the less bang (sound) that I get out of it.
John

We're only responsible for the effort, not the outcome.