221 Remington Fireball brass converted from once fired military 5.56 using a 3 forming die process. Cases have been full length sized and primer pockets have been swaged. Case minimum and maximum length along with all other specifications are to
SAAMI specifications for 221 Remington Fireball and verified using an L.E. Wilson case gauge.
The wall thickness of the necks is .0151".
The cases have been full length sized but it is recommended to neck size the brass during reloading to ensure proper tension on the bullet. Cases will also benefit from annealing and fire forming.