Was sold to me as anti-terrorist? 5.56x45mm/ .223 plastic? core in copper washed steel cup. Brass case. Headstamp - HP/ .223/ 5.56 with C over F on primer. A fleck of metal fell off at the last second, creating a deep scratch in plastic that couldn’t be sand out. Its still a keeper.
I bought some Hirtenberger ammo at a gun show 10 years ago. My 788 in 308 did not like it! The bolt did not want to open after shooting! Best I could figure after doing some research was that it was machine gun ammo. The asshole I bought it from swore it wasn’t and refused to refund my money. I still have a couple boxes somewhere,… but I can’t afford a machine gun.