wabi

Just as a thought, if you can find some T7-3f, try that in your percussion sidehammer is it a percussion? If it is a Flinterall bets are off. I use to shoot 2f but up here in the winter when it gets really cold I could not get the 2f to go off all the time it requires so much heat to start. But with the 3f the granuales are so small you can tap it out under the nipple really easy and it really works for me. I am using Dynamint Noble 1075+ caps also.

or

As Shockey does on TV when he is hunting up north in cold weather he wraps one of little packaged hand warmer over the barrel near the breeck to keep the powder warm.