I shoot the 65 vmax in a 1-10 243. Currently using Varget with excellent accuracy. I’ve never chrono’d the load though.
I’ve had excellent results with superformance and the 70 grain tnt also in the 243, and when I’m done with my stash of varget loads I’ll try that powder with the 65’s.

"I was born in the log cabin I helped my grandfather build"