Hornady Superformance Varmint, 243WIN, 58 Grain, V-Max, 20 Round Box 8343 Superformance(R) 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(R) Varmint ammunition.