About temperatures and ammo.....

In February there was a Trap shoot and when it came time to shoot the Handicap round I grabbed a box of shotgun shells from the back trunk.

I had 6-7 "Bloopers" that cost me enough birds to not place , that day.
I learned that temp's around 28 degrees, do strange things to powder if left out in the cold too long.
I also don't use Red Dot powder for my "Winter loads" any more and use a full 3 Dram load in cold weather.

When deer hunting, my 1st round is kept in my chest, pocket to keep warm, if possible...... and I use MAGNUM primers.