[Jeff Higgins]

The only differences a handloader will have to consider are the reduced case capacity of the 5.56 NATO, and its crimped in primers. If you have a way to get those crimped in primers out, then ream the primer pockets, that issue is solved. The reduced case capacity is addressed simply by reducing the powder charge. Start about 10% lower than the charge you use in commercial brass. As a side note, you should do this (reduce the charge and work back up) any time you start with a new lot of brass, military or commercial. Capacities vary somewhat even in commercial brass, from lot to lot and brand to brand.