At the risk of starting something. But because I've experienced the results I will share this. With this batch of cold temps in the lower 48. Some may want to brave the cold and see how their rifles and other firearms handle the cold. True , Cold . 40 below ambient type temps. Rifle barrels, being made from round , steel alloy . they contract in the cold. The colder it gets , the more they contract. That contraction / making the interior dimensions smaller. Jacks the pressure WAY UP. I imagine most long range hunters and shooters use temp stable powder and often magnum primers to get good ignition and lower SD. Which can spell disaster when a load that produces full SAAMI spec pressures with normal ambient dimension s . Is fired in a much smaller chamber and barrel. Anyway. I just hope everyone is cautious.