Yeah, I had problems with CCI last winter. It would not ignite consistently in the cold (about 17* it suffered most). I got to researching and they changed to a cleaner primer, which happened not to burn as hot. I dropped them from my lineup because of this - I'm out below freezing a lot.
I am really disappointed because they were my bread and butter.
But, money is tight and good, affordable ammo is appreciated. This stuff just works.