Fastest temp stable powder

StaBall Match, H4895, Varget, XBR8208

ETA: 27.5-28.0gr of Varget has worked in 8 different 6mm ARC bolt-gun barrels now. Back off to 27gr if you're running a gasser. You will lose 100fps over the ball powders (CFE223, LVR, etc.) but it's a very stable load.
 
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ARC has been consistently excellent for me in 6.5 Grendel over multiple platforms from 18-24”. Accuracy, temp stability, low SD’s in all varieties of TX weather. Seems to be getting more available, but still very pricey.
 
It's not listed in the load data but I bet Benchmark powder would work too, not sure on "fastest velocity" though.

"Thanks for the info. I settled on 25.3 Benchmark with a 105 Barnes and it worked well. I really like the ARC, but it is a little finicky to load for just because you have so little case volume and are limited on which powders work. But as you said, benchmark works well and so does Lever R"

From a few months back.