Varget
IMR4064
Reloder 15
36.0 of 4064 with a 55, or 36.5 of Varget with the same 55 is what I am running in my 1in12 twist right now.
Wonderful accuracy, getting about 3,725fps out of them.
I jacked the 52 Berger Match Target Hollow Points wayyyy up with RL15. Should have compared these at distance to my V-Max's and BlitzKings, but I had more 55 V-Max's than anything else (still do), and Varget seems to be the least temp sensitive of the bunch. I'm not as crazy about Varget in other calibers, like my 243. But in the 22-250, I really like it. Good luck to you.