I had a bunch of Hirtenberger 7.62 about 10 years ago, found it was a pretty hot load when compared to say SA or LC , my m14 type rifles did not like that stuff too much, cycled the action way too hard for my liking. nice brass tho
not complaining, I think it's awesome marstar has brought this in.
If you can source it, south African, Portuguese and lake city 7.62x51 surplus ammo's are decent for sure. I have not shot any hirtenberger that I can remember so I cannot comment on it at all. I liked the lake city ammo the best by a hair over the others I mentioned, decent accuracy, went bang every time and decent brass to boot. YMMV.
my 14 did not like it 4-6" norc shot better by far