The nork ammo is a bit "hot" compared to northamerican made .223......
I have done a bunch of testing and its at least 150-200 FPS faster out of all my .223/556 guns.....
The ammo is marked as "mil-spec .223" so it may be an over pressure situation in your rifle......
Strange. The Norc stuff I used with my Mini 14 seemed to be less consistent and colder loaded than the Sellier and Bellot 5.56...


















































