I backed my most accurate load at 42.2 down to 41.8 and shot twice trying to zero the scope and the next three shots look like this.
https://vgy.me/5SDohm.jpg
Wish I had loaded more at 41.8 because when I went to 42 and 42.2 my groups open back up. So the added muzzle brake obviously changed the tune. Going to work up another load around 41.8 plus and minus and see how she goes