With Hornady Superformance Varmint ammunition, hunters can now reap the benefits of Hornady Superformance propellant technology in their favorite varmint cartridges which delivers accuracy, increased range, flatter trajectory, less wind drift and devastating terminal results. Superformance Varmint ammunition delivers muzzle velocity 100 to 200 feet per second faster from every gun. These cartridges feature the industry leading polymer tipped Hornady V-MAX bullet that delivers match accuracy and rapid fragmentation. Optimal results are achieved in all firearms and Superformance Varmint ammunition is safe to use in all action types, including semi-autos. 20 Round Box Features and Specifications: Manufacturer Number: 83433 Caliber: .243 Winchester Bullet Type: V-Max Projectile Bullet Weight: 75 Grains Rounds: 20 Rounds per Box Muzzle velocity: 3580 fps Bullet Diameter: .243 Muzzle energy: 2134 ft/lbs Jacket Material: Copper Core Material: Lead Tip Material: Polymer Sectional Density: .181 Ballistic Coefficient: .330 Casing: Brass Uses: Varmints, Predators