LOG EYE
First, like targshooter said, let your barrel cool a bit between shots.
Second, when all else fails, try Sierra SBT Game Kings!
I had been loading Nosler Ballistic Tips, 180grn & 165grn, in my 30-06 BAR and quite frankly would have been glad to get a virticle string or any other kind of consistent pattern. They just shot all over the place.
Someone suggested trying the Game Kings and now she is shooting well under MOA.
Luck
firstshot