Help with 28 Nosler load development

[Toydy]

Hey there guys.
Just started load testing for my 28 28inch proof barrel, 25 rounds in.
I am using 175 ABLR and AR 2218 or H50bmg for my American brothers.
Found max powder to be 93.5 grains.
Shot a 3 shot group at .02 off lands 3100 , 3104, 3098. Problem was the group was spread over 1.5 inches at around 150 yards.
Where should I go from here?

 

[Bravo 4]

25 rounds in isn't a lot, may not be enough for your barrel to settle down. Some may tell you that you did it backwards and to find where the bullet likes to be first then adjusting powder, some will tell you to do a ladder test or OCW. However you could try adjusting seating depth, maybe a change in primers.