Recently I bought some WC 844 pulldown powder.
There is risk in buying powder that the military decided was so old that it had to be scrapped.
You really don't know what is in the jug, ball powders can be mixed together and how the heck would you know?
In cold weather ball powders require a magnum level primer and they require a strong firing pin strike. The mainspring in a M586 I bought was absolutely worn and I got squibs and hangfires in cold weather with a ball powder. I changed to a new mainspring and the problem went away.