I shot four 143 ELDs with RL26 in the 6.5, two at 6deg after sitting out all night and two at 65deg. They only lost 20-30 FPS.

Edit: RL16 lost nothing. Hodgdon extremes lose very little (I’ve tried Varget, H4350, H4895, & Benchmark), and 8208 is quite good. Ball powders have typically lost 70-100+.