I used to be involved in ordnance testing back in the 1980's where we were required to temperature cycle our devices from -40 to +165f. "Accelerated Aging": ten cycles a day, 24 hrs a day for 2 weeks as I recall. The chambers had an oven above and a freezer below with an elevator to present the test items to the required environment.
Few of the propellants we used were off-the-shelf although we did use Bullseye and Unique in a few devices. Anyway, the vast majority of the propellants were either single or double base purchased from the same propellant houses that made commercial rifle and pistol propellants: Alliant, Hodgdens, Accurate Arms, etc.
After environment testing the devices were fired and a pressure/time trace recorded for each test to be compared with data from devices that had not been subjected to such testing.
Qualified devices showed no effect from these environmental tests.
Incidentally, in regard to the comments above; when fired at -40f some propellants showed HIGHER peak pressure than at ambient which the chemical guys attributed to fracture of the propellant grains resulting in more surface area of the grains. This didn't happen until extremely low temperatures were used so, unless you plan on shooting at -40f, it's nothing for the average shooter to worry about (and very little to worry about even if you do).