I don't get too caught up with temp sensitivity. I've loaded rifle ammo here in Ohio in July and August with Reloder powders, IMR powders, VV powders, and AccurateArms powders and hunted out west in fall where it's colder and killed everything I ever shot at. Granted, I'm a lucky guy I guess because everything is typically within 350 yards.
If temp is a major concern for you then load your ammo during the same time of year you plan on hunting with it. No worries.
Can't do that really, my schedule won't allow it & the difference between AR. summer and WY fall is quite extreme. Of course shooting when you get there helps.
You will not make peace with the Blue Coats, you are free to go.
Most of the 7.62 NATO match ammo (M118 & M852) was loaded with IMR4895; none used IMR4064. But that was when Remington was operating the Lake City Army Ammo Plant. When Winchester took over, they tried some ball powder in the match ammo; was not all that accurate. Commercial company's match ammo, Federal Gold Medal Match for example used a lot of IMR4064 as well as one or two Re powders. Nobody's got consistantly good accuracy with any ball powder in such cases.
In bolt action match rifles, bullets 168 to 190 grains shot most accurate with IMR4064 when the .308 Win was popular in matches. 200's and 220's shot most accurate with IMR4350. This combination won most of the matches and set virtually all the records.