![I need some help finding out what this is. It is 7.62x51 and we are 90% sure they are steel core. We don't know what the black ring is for maybe an I need some help finding out what this is. It is 7.62x51 and we are 90% sure they are steel core. We don't know what the black ring is for maybe an](https://i.redd.it/ujpld95p01k51.jpg)
I need some help finding out what this is. It is 7.62x51 and we are 90% sure they are steel core. We don't know what the black ring is for maybe an
![7.62x51 NATO API (wts & extra info) - General Ammunition Discussion - International Ammunition Association Web Forum 7.62x51 NATO API (wts & extra info) - General Ammunition Discussion - International Ammunition Association Web Forum](https://global.discourse-cdn.com/business6/uploads/cartridgecollectors/original/3X/5/e/5e27c2d8b4d402023b689cd265da699466f35da2.jpeg)
7.62x51 NATO API (wts & extra info) - General Ammunition Discussion - International Ammunition Association Web Forum
![PRVI Partizan (PPU) Ammunition 7.62x51 NATO 145 Grain Full Metal Jacket Boat Tail, M80 Ball - 500 Round Case PRVI Partizan (PPU) Ammunition 7.62x51 NATO 145 Grain Full Metal Jacket Boat Tail, M80 Ball - 500 Round Case](https://cdn11.bigcommerce.com/s-b7687/images/stencil/1280x1280/products/6001/18816/PRVI-762x51-M80-Ball-20rd-White-Box-s-o__71118.1560317398.jpg?c=2)