Re: Temp. sensitive powders ?
The most temp stable powders I have played with are the Hodgdon Extreme extruded powders. They seem to work very well from winter to searing summer.
Range, dial up, shoot, hit regardless of season.
They used to be little to no change in my loads. However, recent lots have varied a bit. Enough so that I have to adjust up to 1/2 gr even with larger cases like the RUM.
Unless you are looking for very small groups, you will probaly not notice any difference with the Hodgdon.
If using some older tech powders, there can be a difference of up to 200fps from very hot to very cold. That will throw your drop tables way off.