Re: accuracy changing with temperature?
labrat, have a RUM and was using H870. Shooting during our super hot summer was an adventure. Yes, changes is temp can have dramatic effects on pressures and pressure curves/barrel harmonics.
That is why I use h50BMG during the warmer months now. It is supposed to be temp insensitive and the other powders in the Extreme line seem to work very well from freezing to toasty summer heat. The h50BMG shoots better too.
If you like the Re25, just adjust as necessary as the temps warm up. It should still work fine.