These Hornady unprimed cases have 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. The cases have uniform wall thickness vital to accuracy. Every single Hornady case, regardless of the lot in which it was produced, is virtually identical to other Hornady cases in the same caliber. This means consistent pressures, velocity, and accuracy every time.Specifications: Manufacturer: Hornady Material: Premium Brass Series/Collection: Hornady Unprimed Brass Cartridge Cases For Use With: Rifles Caliber Multi: .300 AAC Blackout Application: Reloading Packaging Quantity: 50/Bag