Bill:
Each rifle will have a preference to certain brands of ammo, due to barrel harmonics, rifling, etc.
Try different brands, shooting groups of 10 shots at 100 meters and make your selection, based on your budget.
My rifles all produce excellent groups with Lapua Midas ($900 / case). They also produce excellent 100 meter groups with Fededral 900 (around 0.80 inch) and 1.25 inch groups with Federal 711B.
Like most all of us, I have to pay bills and put food on the table, so I use Federal 711B ( around $200 / case) on chickens and pigs, saving the Federal 900 (around $360 / case) for rams & turkeys. I do this for big matches with my Anschutz, Remington 40X or Sako Finnfire rifles).
My Anschutz really likes Wolf Match target ($250 / case), but the ammo produces 3 or 4 fliers out of every 50, so I use that stuff for normal matches. My Sako Finnfire hunter class rifle does not work well with Wolf MT, but does so with CCI Std. Velocity, so that is what I use for normal matches.
None of my rifles care for Eley Silhouex, RWS, PMC or Aguila ammo.
I have found CCI Std. Vel. ammo to be very consistent with all my rifles. At $180 / case from Grice, it is not a bad deal for informal matches. You might want to try it. Best of luck, :cb2: