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Ruag GP 90 shoots about the best out of mine (Colt 1:7 twists). Equal to or better than some 68 and 77 grain match ammo from Blackhills shooting at 400m & 500m.
For match quality ammunition, I handload (or at least try to ).
As others have stated, for general training & up to around 200m the Winchester whiteboxed 'USA' brand ammo works (most times) well. You will find on the occassion though, that groups will grow from a decent 1.5" - 2" at 100m to 5" - 6" for no apparent reason (not shooter error ), using the same lot and even ammo from the same box.
Aside from this minor issue, it is decent ammunition for the price.
X2. I don't shoot precision matches so this stuff works just fine. I know my 20" HBar shoot ~1.5" at 105 yds with this cheap surplus ammo. I use anything on sale thru my AR's. All seems to work fine.