Hornady Superformance Varmint, .243 Winchester Super Short Magnum, 75 Grain, V-Max, 20 Round Box 80411 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 from EVERY gun. Accuracy, increased range, flatter trajectory, less wind drift and devastating terminal results are all realized with Superformance Varmint ammunition.