Funny, I am currently working up a nearly identical load (243, 20" 9 twist, 58v-max).
I tested Varget and H4895. It may be just the lots I have, but I found H4895 to be much faster across the board. 43.0 grains gave me about 3850 fps out of a 20" barrel, whereas 44.0 grains of Varget (both...