This Prvi Partizan ammo is specifically designed to meet the pressure requirements of your M1 Garand to help protect your classic investment. This ammo is specially formulated to have the correct pressures to function properly in your Garand without damaging your op rod.Most modern 30-06 ammo features pressures that are too high to be used in an M1 Garand and are designed for modern bolt action hunting rifles.The neck of this cartridge case shows annealing marks which is the process all ammo goes through to make the metal more malleable to reduce the chance of cases splitting when seating the projectile.Additionally the annealing process allows these cases to be reloaded in the future. Manufactured in Serbia this Prvi Partizan ammo is brass cased boxer-primed and non-corrosive.