Picked up a couple of 200 rd boxes of ammo at WallyWorld, FC .223 lot # SMQ19G824-042 headstamp FC 223 REM and Winchester 5.56 lot # SMQ19K859-081 headstamp WIN USA 5.56. Isn't Federal/Lake City the only ones using the SQM lot numbers? If so sure looks likely they are loading bulk ammo for Winchester.