Ammunition Specifications Caliber: 357 Magnum Bullet Weight: 158 Grain Bullet Type: Jacketed Hollow Point Case Type: Brass Quantity: 50 Rounds per box Blazer Brass is loaded in reloadable brass cases for added value. Standard Boxer-type primers and primer pockets mean you can reload Blazer Brass cases just like any other case. CCI primers insure reliable ignition, and are loaded with clean-burning American made propellants. Blazer Brass brings shooters the reliability and quality of American-made ammunition built to U.S. industry standards, and it s backed by the stringent ISO certified quality systems at CCI.