Mine seems to shoot all the quality ammo about the same. I have shot Black Hills 77gr BTHP Match, Federal 69gr BTHP Match, Black Hills 50gr. Vmax, and Federal 40gr Nosler, with the same results....all one hole groups at 100yrds.
The only difference is the point of impact changes.
I settled on the Black Hills Vmax as I use the rifle for coyote hunting and it does a great job on them.
Here is my .223 and a 5 shot group at 100yrds with the Black Hills 50gr Vmax ammo.
Take care,Stan