We only make match grade bullets, which means that we use the highest quality copper and lead available. The copper is made into the J4 Precision Jacket, which is recognized around the world as the bullet jacket with the best concentricity available. We don't just claim to make jackets that measure .0003 or less variation in wall thickness, we actually do it. This can be verified in every lot and is the reason why benchrest shooters who make bullets by hand use J4 Precision Jackets exclusively. More often you will find that J4 Precision Jackets measure .0002 or less. We make all of our J4 Precision Jackets and bullets on one set of dies to insure that all of the bullets in each box are as consistent as possible. Consistency is the key to ultimate accuracy and no one makes a bullet as consistent as we do. This is not loaded ammunition.