I've only used one battle pack of 7.62 Hirtenberger, "With the NATO cross."
It was very pretty, and the groups were the largest I've ever seen from my M-14S. I never once missed the (Metric) target; IOW, very pretty s**t.
(I assume that the particular lot was of sub-standard quality.) Even the cheapest copper-washed Norinco s**t had groups that were smaller.