So I worked up some loads and tested them while the temperature was 95 degrees. I found an accuracy node that goes from 61.1 - 61.5 grains with Velocities of 2975-3000 respectively. Normal hunting Temperature is about 40 degrees. My initial thought was to split the difference and load 61.3 grains to minimize any variations I induce with brass size, primer charge, powder charge.... BUT I am now wondering if I should load at 61.5 grains to account for a possible velocity drop when hunting in cooler weather (I don't know how temperature sensitive the powder is, Hodgdon Superformance) So the basic question is, Does the powder charge mean everything for accuracy or Does velocity? If I loaded 61.1 gains with velocity of 2975 while hot and the velocity I see at 40 degrees is 2930 can I expect my group to change and be more consistent with a group with a lower powder charge when it was hot? I would theorize that 61.5gr @ 95 degrees has the same chemical energy as 61.5gr @ 40 degrees but the burn rate changes to cause the difference in velocity? But how do you experienced loaders deal with this?