The 55g varmageddons are my go to bullets in the 6x6.8.
I'm using 32g h335, 3576 fps, accurate as heck, flop coyotes.
I was using the 55g nbt, but the varmageddons are cheaper and shoot exactly the same.
I have a post under reloading on my h322 powder tests under masterBs post with the 55g bowlers. COL is 2.280" in the Savage, in the AR col was 2.250"