Have found Hunter to be fairly temp-stable, though in some instances not as much as TAC, Big Game and Magnum--all of which have done very well in my tests. An example is the handload Eileen uses in her NULA .257 Roberts, with Hunter and the 100-grain Barnes TTSX. Muzzle velocity drops about 100 fps from 70 to zero Fahrenheit, but point of impact doesn't change, so she's used it with no problem down to -15 or so. That's with Federal 215 primers.
