I've run loads on the edge using compressed loads and the slowest powder for a particular round. I've found that temp consistancy within say plus or minus about 20 degrees is good.
So in the summer "No Sun" In the shade or even a cooler if I think that the inside vehicle temp might climb way up. Cooler and winter I carry my shells in my inside coat pockets that still maintain 70 degrees or so do to body heat even in the extreeme cold.
I don't use that powder. But only careful notes on chrono testing of temp readings will give you correct information.
.270 Ackley improved 29 inch 1.250 dia. target barrel 7mm STW 28 inch 1.250 target barrel. I also love my .458 mag for varmints and the biggest game in the world.