I'm no expert but I agree. I have fired 7.62x39 that was so cruddy it was not only green it was green with lumps (so not steel cased). Several I had to scrape the 'bumps' off of them to get them to chamber. The SKS didn't care, they went in the short end and then left via the long end.If they look okay, they probably are. Mine didn't even look okay.