We have hodgdon extreme line of powders that claim little or no change from 0 degree's to 125 degree's. When I had my 7mm rem mag a friends dad loaded IMR 4831 for me and it worked awesome, but our deer season did not fall during winter like conditions like it does here in Idaho. I know last spring I tried some hodgdon US869 in my 300RUM and was very disapointed in its performance, when I tried it the temps were about 36 degree's and my bullet was dropping enough at 100 yards to where I couldn't even hit the target. But then I switched over to some retumbo loads and bullseye every time. So which powders are less effected by temps. I have heard RE22 is very temp sensetive. But a friend ran some of my loads with his quickload program and both RE22 & RE25 showed not to be a good choice. Currently I shoot a 300RUM and my wife shoots a 300SAUM. We have a several powders to choose from, retumbo, H1000, US869, MagPro, IMR4350, IMR7828SSC, H414, Varget, RE17, RE22, RE25. So which powders work good through out all the seasons, if there is such a powder???? Thanks for any info.