I was given these 308 rounds several years ago along with a shitload of brass by a cousin that lost his right to own firearms , at the time I didn't own a 308 cal rifle , so just stored them away , just built my 1st AR10 and getting ready to start reloading for the round and came across these loaded rounds , they appear to be factory , with sealed primers , but I've never seen this headstamp , anyone familiar with this headstamp , I'll probably pull a bullet and weight it and the powder charge , just for reference.