fgw H322 is an extreme powder if hes talking about the H322 i know and use .... I myself havent used anything but Hodgdon Extreme H322 H4895 H4350 and Benchmark and its been my experience that from -20* in Indiana coyote hunting to 107* in South Dakota on the prairie it shoots the same for me... Or has So far.. Maybe i Dont test as much as everyone else Ive seen this Come up more than once here recently but IMHO and experience I wont use a powder thats not Extreme. I load all winter to shoot prairie dogs in the summer so its gotta be right for me but my R-700 loved H322 and 52smks all day