I have heard about temperature sensitive powder since I started reloading. That was about 1966! I have never run into a problem that I'm aware of with any powder. I suspect temp can make a difference but I have never noticed it. I have never loaded and worked up loads in freezing weather, I like spring weather for working up loads. I have never hunted in weather in the 90+ range either. Make's me sweat to much. I just don't see this as being the problem it's made out to be but I do guarantee you one thing. You think you need it and someone is gonna develop it for you for a price! Manufacturer's are much more tuned into what you want than what you really need!