Who's components in the rifle build?
As far as ammo, get a couple boxes of various weight bullets at Interstate Guns or Academy and see what shoots best.
I'm using Federal Gold Medal Match 90gr SMK. Easily getting well under 1moa even out to 600 yards with good wind conditions. I'm using a 24" Krieger Barrel 1.8 twist from WOA.
I find 88 Honady Match to be the best in my Airborne Arms Rifle. From what I see rifles are very ammo picky in this calibers. Mineral Man is right, buy a box of each load you want then decide what works best for your rifle. The only one my rifle is picky with Is the 90gr Federal Fusion Soft Point rounds. I picked up 200 rds of the stuff before I actually shot it, because of the rebate from Federal.
Let us know more about the rifle and how it shoots.