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I use Varget in my .223 and Imr 4064 in .308. I find both are very temp stable. Off the top of my head, according to a test spreadsheet I downloaded on the topic, I think Varget has a temp sensitivity factor around .3 and IMR 4064 around .4...so it takes about 2.5 degrees to increase IMR 4064 by 1 fps and Varget takes about 3 degrees to do the same.
I use 4064 because it works great in .308 and it is what federal uses in the 175 and 168 gr gold medal match .308. But Varget is fine too and I use it in .223 but wouldn't hesitate to use it in .308
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