You might try some of this... And read the whole product description... as they are probably corroded cases and the case head has been milled to remove the headstamp.
And while I have had no issues with it in my Large frame AR's ( tuned to slow / delay the bolt unlocking, and extracting at a lower chamber pressure ) ... YMMV !!
I WOULD NOT RECOMMEND IT for the rather vigorous M1A's action or a Typical large frame AR setup..... since you could easily rip the rim off.
The bad news... quite a bit of mine was corroded, still shootable ... but , and the cases are berdan primed.
The first link is to SGAmmo... his description and photos show the headstamp milling I am talking about. A google search will find some in stock
https://www.sgammo.com/product/308-win-762x51-ammo/1000-round-case-308-win-148-grain-fmj-german-military-surplus-ammo-am203This is how it shoots in my large frame AR's... 20rds 100yds.
And FWIW... all my .308 AR's ... shoot the ZQI like a finely tuned shotgun.. crazy, horrible shotgun pattern groups. That bargain ammo ... was no bargain.