DaveP:
If ypou can find the stuff, Government Match Ammunition, the white box stuff loaded at Lake City usually worked well, though each rifle could be "a law unto itself". I understand that the Federal Match, that the marines used to use was quite good also.
It was loaded with 168 grain bullets, Sierra I think. The National Match (Lake City) was loaded with the FA Match Bullet (nominally 173 grain), which held up better at long range, beyond 600 yards. The thinking was that the 168 grain bullets lost gyroscopic stability by the time they reached 1000 yards, in 7.62 NATO loads, the 173 grain bullets hadn't.