What you have read is true. Alliant RL powders are VERY temp. sensitive. I have some great loads with RL 22 and RL 25 but have started using Hodgdon H 4831 in place of them because of the temp. insensivity. My experience was I developed a load shot great with good velocity in late spring. When I shot the rifle in early winter my point of impact moved about 3 inches. After switching to Hodgdon the problem of point of impact moving was solved. My velocities are a little lower but I DO know where my bullet is going to hit.