.45 AUTO Pistol Brass Headstamps are Mixed Unprocessed Range Brass Mixed Large and Small Primers 100% Nickel Casings 1000+ Casings Reload with nickel|plated brass 45 ACP cases, designed for durability and efficiency. 45 auto nickel|plated brass is a popular choice among shooters for its ability to withstand harsh conditions and repeated use. Originally developed to improve case longevity and resist tarnishing, nickel plated 45 brass is easier to identify and clean during the 45 brass reloading process.