Funny you bring this up. I worked up a load with IMR 4350 and 145gr. GS's in my 7x57 while the weather was 70-80ish. I bought some Hunter to try but never had the time to load any.
Early Monday morning I went out and shot the rifle after the ammo sat in the garage all night and I believe the low was 20ish.
They averaged 120fps slower and the zero was about 2 1/2" low at 100yds.
Didn't really care until I shot it @300yds. Waaaay low.
Glad I checked. These MT natives say it gets cold here sometimes.
