Originally Posted by elkaholic
RL25 is a good powder for velocity and accuracy but not very good for temp sensitivity. Retumbo is much better in that respect and gives at least as good velocity and accuracy. (at least in the 3 RUM's I've had).........Rich
I have experienced this also, same powder. 300 fps delta from winter to summer.
Retumbo is my powder of choice for a hunting rifle in 300RUM