Picked up some rounds the other day labeled .308 win. I thought they were mil-surp but they could've been reloads.(I'm new to this stuff). Anyway I opened the bolt and put one in the chamber but the bolt won't lock. When I pull back it still ejects the round. The brass is labeled LC LR 07. I put a Winchester ballistic silvertip in and the action is smooth as silk. Any ideas?