Too cold for working up hunting loads?

I only test my loads in the summer heat so I never have to ask myself if the pressure will rise too high later. I know it leaves less opportunity but I just find it most practical.

I haven’t ever had any problems with point of impact shift when I deer hunt mid November even at considerable range.
 
Thanks for all the experience/info guys I appreciate it!

Did wonder if its hot inside the truck with the heater going, is it really that much different? But I know not such things lol
 
I normally do load development when it’s decent outside. However I zero the rifle at the start of hunting season and then check the zero in late season (mid-November ish), when it’s cold. Previously, I substituted IMR4350 for H4350 in my 280 AI and saw quite a bit of slowing in November, which motivated me to recheck zero’s at cold temps.
 
I don't mind shooting in cold weather, but it's more for shooting practise than load development. At -15 and colder my groups tend to grow. Quite sure it's not the rifle or the load, it's the shooter.
 
Something I look for in a load is what it does a grain or so above and below the chosen load. If backing it off a bit causes the groups to fall apart, good luck shooting your summer developed load when its frigid out. On the opposite side, if you can’t sneak another grain without ejector marks or sticky extraction or something else that alarms you with your winter developed loads you’re probably ####ting a little too close to the porch as they say. Good luck when it warms up.

The same goes for zeros. If you can’t go down a grain and up a grain and shoot an acceptable group with the mixture it isn’t much of a load. To be honest it might not be much of a rifle either.

If its forgiving on the reloading bench, and the shooting bench; it will likely be able to stare down your average thermometer.
 
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