HP 7.62x51 .308
Are you able to get a clear picture of the headstamp or write down what it says please?
I know headstamps are very tricky to get good pictures of and I use two methods:
1 - If it is a picture for my database, I use a flatbed scanner.
2 - If it is a quick pic to post here, I use a USB microscope.
If it is a purple tip it should be a sniper load.
yes, purple tip.
HP is Hirtenberg-Patroner, an Austrian company.
They have knack for marking cartridges with both designations (.223, 5.56 and .308, 7.62x51 like in this case).