^^^^I believe darkker is over stating his position. Some powders are very temperature sensitive in certain applications, others are less so. But that's only based upon my own personal experiences with many different powders, bullets and cartridges. 25-06 with RL-19 comes to mind... a particular load shot consistent .5 moa in 10 degree weather and went to pot in 50 degree weather. The same rifle had much better consistency across the same temp ranges with Hodgdon 4831SC. There are always good academic explanations for these kinds of experiences, (perhaps my rl-19 load was operating on the edge of a "node") but time and again I find some powders are truly more temp sensitive than others. Are there solutions to the "problem"? Probably. Maybe certainly. Does that mean some powders are NOT be more or less sensitive to temp variances? No, it does not. JMHO.