Can anyone point me to any data on temperature sensitivity of Lapua rimfire ammo? I've noticed that under 50F my good lot of CenterX is less good. Today I played around with that CenterX and some Biathlon Extreme in temps just above 50F, and it looks like the CenterX slowed down 20 to 30 FPS from summer temps, while the Biatlon Extreme is currently shooting about the speed that I get in the summer with the CenterX. Is there any more comprehensive data available?