All the commonly used ADI powders have this consistency in different atmospheric conditions. Unless things have changed recently, Varget is re-labelled ADI 2208. I don't know if you guys Stateside get ADI labelled powder on the shelves, but if you do 2208 is what you are looking for. ADI 2206H is a good alternative if you can't get your Varget or ADI 2208. The burn rate is a tiny bit faster. If you have a longer sort of barrel, ADI 2209 will also be worth looking at, it's a tiny bit slower.Back in the days of long ago... (like 7-8 years ago but we are in a golden age of development).
Varget was one of the first powders developed with very stable temperature sensitivity. Many of us developed loads based on Varget. It works great with .308 - especially with bullets over 165gr. It works great with .223 - especially with bullets over 60gr. It can be loaded in winter and shot pretty much unchanged all year 'round. (Remember - this was 5 B.C. (before Creedmoor)).
Yes, there are other powders out there. Yes, they are better. Yes, we are to lazy to work up a new load. Yes, yes, yes - flame on haters. (putting this here for the inevitable quoting later)
The timing of Varget reaching market coincided with the explosion of long-range shooting. It is what many of us cut our teeth on and what we developed with. When it goes on sale I buy 16-24lbs, always saying "This is the last", and it never is. It is just too easy to work with.
I am; however, slowly starting to switch to CFE-223. It is cheap, always available, and meters like water.
Maybe not the explanation you were looking for, but maybe it helps.
The Winchester powder equivalent of ADI 2208/Varget, is 748. The Winchester equivalent of ADI 2209 is 760. ( Disclaimer; Hope this helps those who don't already know...)