HSM Ammunition .357 Magnum 158 Grain Lead Plated Flat Point Pistol Ammo 50 Rounds. 357 Magnum 158 Grain Lead Plated Flat Point Pistol Ammunition online at OpticsPlanet. This HSM Ammunition Ammunition features Flat Point bullets that deliver strong stopping power perfect precision and consistency. With great promotions on Ammunition and other superior pistol ammo from trusted brands like HSM Ammunition you re sure to find the perfect firepower for your next hunting trip or range visit. Stock up today to save big on ammunition and other top-tier tactical hunting and outdoor gear at OpticsPlanet. Specifications for HSM Ammunition .357 Magnum 158 Grain Lead Plated Flat Point Pistol Ammunition: Manufacturer: HSM Ammunition Caliber: .357 Magnum Number of Rounds: 50 Bullet Type: Flat Point Bullet Weight: 158 grain Dimensions: 2.00 X 2.70 X 5.30 in Bullet Tip Material: Lead Package Contents: Hsm Ammunition Hsm 357 Mag 158gr Lead Plated Flat Point 50rd 20bx/cs