Lake City 5.56 cases are made of harder brass and not made thicker than .223 cases.






How Hard is Your Brass? 5.56 and .223 Rem Base Hardness Tests

http://bulletin.accurateshooter.com/2014/05/how-hard-is-your-brass-5-56-and-223-rem-base-hardness-tests/





Bottom line, Lake City 5.56 cases are made Ford Truck Tough and will last longer than Lapua .223 cases. (or Chevy trucks)