HSM Ammunition Cowboy Action .357 Magnum 158 Grain Semi Wadcutter Brass Cased Pistol Ammo 50 Rounds. Maybe you just like to go out on a weekend and shoot the Guns that "Won the West" or that your favorite TV and movie cowboy heroes used. Either way HSM has you covered. More calibers more selection in both pistol and rifle. Each round crafted with cowboy integrity and grit. A perseverance-for-perfection cowboy spirit. Perfect for your personal cowboy pistols and rifles. Bullet type Semi-Wadcutter- Hard Lead. Specifications for HSM Ammunition Cowboy Action .357 Magnum 158 Grain Semi Wadcutter Brass Cased Pistol Ammunition: Manufacturer: HSM Ammunition Caliber: .357 Magnum Number of Rounds: 50 Bullet Type: Semi Wadcutter (SWC) Bullet Weight: 158 grain Cartridge Case Material: Brass Muzzle Velocity: 1175 ft/s Application: Target Primer Style: Centerfire HSM Ammunition 3571N: Cowboy Action .357 Magnum 158 grain Semi Wadcutter Brass Cased Pistol Ammo