Fiocchi Field Dynamics. Gov 300 Grain JHC Brass Cased Rifle Ammo 20 Rounds. Field Dynamics ammunition is comprised of high-quality components to ensure repeatable point-of-impact and optimal terminal performance from a pointed soft-point projectile. Priced to give hunters plenty of opportunity to practice field-rest shooting and be assured of their rifle's zero and point-of-impact across all hunting distances. Specifications for Fiocchi Field Dynamics. 45-70 Gov 300 Grain JHC Brass Cased Rifle Ammunition: Manufacturer: Fiocchi Caliber: .45-70 Government Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 100 grain Cartridge Case Material: Brass Muzzle Velocity: 1900 ft/s Application: Big Game Hunting Primer Style: Centerfire Package Contents: Fiocchi Field Dynamics. 45-70 Gov 300 Grain JHC Brass Cased Rifle Ammunition What is Fiocchi Field Dynamics. 45-70 Gov 300 Grain JHC Brass Cased Rifle Ammunition good for? The manufacturer suggests that it is suitable for hunting big game.Fiocchi 4570B: Field Dynamics. 45-70 Gov 300 Grain JHC Brass Cased Rifle Ammo 20 Rounds