Defend your home from would-be intruders with superior lethal defense using Federal Premium® .357 Mag 130gr HSJHP ammo from GunMag Warehouse. Introduced in 1989, Federal Hydra-Shok® ammunition remains one of the most popular choices among self-defense experts. Manufactured to tight tolerances with superior quality control, this personal defense ammo offers hard-hitting accuracy and devastating penetration and expansion for unmatched lethality when it matters most. Better yet, this ammo features reloadable nickel-plated brass casings for improved performance in virtually any environment. 20 rounds.