In cold weather I shoot the Thompson Center Mag Express Sabots out of my Black Diamond XR and have never ahd a problem. When loading anything else, I shoot a Harvester sabot. In my Green Mountian Barrels (which are the maker of Knight Rifle barrels) they do not seem very fussy about what I shoot out of them in cold weather or any weather for that matter.

The best thing to do is get a number of different sabots and projectiles and when your in the cold next time do some practice and see which loads the best and gives you the best accuracy.