CatShooter is correct, I would not expect CFE 223 to be as temp. stable as the extreme powders. I doubt there are enough rounds down range yet with it to say just how sensitive it is. BL-C(2) and H-335 have always been some of the worst offenders in my rifles. X-Terminator seems to not be quite as bad. It looks like we will be in the 50's tomorrow and in the low teens by early monday morning. If I am industrious enough, I will put some ammo and the rifle in the -30 freezer overnight and we will see what happens.