I do with a fair degree of success. Norc ammo on the other hand... well their 7.62x39 seems decent but my experience with their 556 has been erratic.
But dude in gp if it was grouping better before then grouping significantly worse... are you keyholing any of the hits? Might be something is contacting the projectile that shouldn't be.
Great call! I will check this next time I am at the range.