Tight Wall Concentricity : Concentricity helps to ensure proper bullet seating in both the case and the chamber of your firearm. Higher concentricity also aids in a uniform release of the bullet on firing, for optimal velocity and accuracy. Uniform Case Wall Thickness : Benchrest shooters have long known that uniform case wall thickness is vital to accuracy. Hornady manufacture to extremely tight tolerances to ensure this critical element is as consistent as possible. More Reloads per Case : Hornady treats their brass as the foundation for an accurate cartridge, not a commodity so you'll get more reloads. Consistent Weight and Capacity : Every single Hornady case, regardless of the lot in which it was produced, is virtually identical to other Hornady cases in the same caliber. For you, this means consistent pressures, velocity and accuracy - every time.