I ran 55gr NBTs leaded and unleaded, couldn't tell them apart out of my 10 twist 6mm-204 at 3600 to 3700 fps. 62gr VGs left huge exits, a talk with Barnes suggested that I wasn't moving them fast enough to get them to disintegrate in the coyotes.
The 6mm-204 barrel is in the barrel rack, so I'll be experimenting with them in a 7.5 twist 6mm ARC. Right now I'm focusing on 65 and 75s out of it. The 75gr Speer HP Varmint s looking good, I'll be interested when I can put it in a coyote, it is an old time bullet that is really reasonably priced.