HSM Subsonic 45-70 Gov 550 Grain Hard Cast Lead Brass Cased Rifle Ammo 20 Rounds A. This HSM Ammunition Ammunition features Flat Nose (FN) bullets that deliver powerful stopping power perfect precision and predictability. With amazing deals every day on Ammunition and other superior rifle ammo from trusted brands like HSM Ammunition you re sure to find the ideal cartridge for your field or range use. Stock up today to save big on ammunition and other top-tier tactical hunting and outdoor gear at OpticsPlanet. Specifications for HSM Subsonic 45-70 Gov 550 Grain Hard Cast Lead Brass Cased Rifle Ammunition: Manufacturer: HSM Ammunition Caliber: .45-70 Government Number of Rounds: 20 Bullet Type: Flat Nose (FN) Bullet Weight: 550 grain Package Contents: HSM Subsonic 45-70 Gov 550 Grain Hard Cast Lead Brass Cased Rifle Ammunition