Last year I bought a new Savage heavy barrel and 10 boxes of Federal 5.56 ammo the Black Label stuff that was loaded in LC Cases.
Started getting misfires with the ammo so sent the rifle back to Savage and the ammunition went back to Federal. Savage checked the rifle out and couldn't find anything wrong with the rifle. Federal sent back ten new boxes of the same type ammunition and claimed there wasn't anything wrong with the ammunition.
So I tried the new Federal ammunition and every other cartridge would not fire. Tried the Federal ammunition in a CZ and it misfired. Both rifles fired every other type of ammunition so my best guess was faulty ammunition. Called Federal and they told me the ammo was made for the AR rifle and the bolt guns didn't have enough striking power.
So trade all the unopened boxes back to my gun store. Today I was shooting with a friend and we tried the remaining Federal ammunition in two different AR and it misfired in both.
This was my experience with the Federal 5.56 ammunition loaded in LC cases.