Buy 357 Magnum Ammo For Sale In Stock Online. 357 mag ammo packs a punch and is a great caliber for self-defense, hunting and range use. An iconic round used in large revolvers, 357 magnum rounds have powered the firearms of hunters and police officers since 1934 and truly began the era of “Magnum” handgun ammunition.
.357 Magnum as a caliber was designed in the mid-1930’s by a group of ballistic experts that included famed hunter and experimenter Elmer Keith. This group of firearms experts was looking for a round that could take down targets that wore early versions of bullet proof vests in the bootlegger and “gangster era” of United States history. To penetrate through these early versions of bullet proof vests, testing indicated that 357 bullets must travel more than 1,000 feet per second — something that the round was more than capable of achieving.