Magtech 357 Magnum 158 Grain Cowboy Action Lead Flat Nose Brass Cased Pistol Ammo 50 Rounds. An excellent choice for single action revolvers and lever action rifles. Specifications for Magtech 357 Magnum 158 Grain Cowboy Action Lead Flat Nose Brass Cased Pistol Ammunition: Manufacturer: Magtech Caliber: .357 Magnum Number of Rounds: 50 Bullet Type: Lead Flat Nose (LFN) Bullet Weight: 158 grain Cartridge Case Material: Brass Muzzle Velocity: 1085 ft/s Application: Target Package Type: Box Primer Style: Centerfire Lead Free: No Package Contents: Magtech 357 Magnum 158 Grain Cowboy Action Lead Flat Nose Brass Cased Pistol Ammunition Magtech 357L: 357 Magnum 158 Grain Cowboy Action Lead Flat Nose Brass Cased Pistol Ammo 50 Rounds