Last fall I bought a Savage model 14 in 223Remington. As you remember there was a shortage of ammo then. Ibought a 400 round case of Federal Ammo, XM193F 5.56mm M193 ball, I shot a box of twenty with no problem. Now my question is: Is this safe to shoot in my gun as I have been reading that 5.56mm ans223 ammo are not the same, the Csaes are marked L C 08 but no NATO mark. Thanks for any help.