Speed Kills. Varmint hunters can now reap the benefits of Hornady Superformance propellant technology in their favorite varmint cartridges. Superformance Varmint ammunition delivers muzzle velocity increases of 100 to 200 feet per second, accuracy, increased range, flatter trajectory, less wind drift and devastating terminal. It utilizes a polymer tipped bullets which 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. This 243 Winchester load features a V-Max bullet with a 58 grain weight and comes packaged 20 rounds per box, 10 boxes per case.