I did shoot some 180 ABs with Benchmark and N530 in cold and at room temp. Ammo and rifle sat out a few hours at 9deg. All 8 were loaded at the same time from same group of brass, primers and bullets. I randomly picked two for the cold and left two of each indoors. I alternated firing each
Benchmark was a couple FPS faster in the cold. More variation in the N530 readings.