Starline Brass 500SWEUP50 Unprimed Cases Handgun 500 Smith & Wesson Magnum Unprimed Brass 50 Per Bag

The Initial run of 500 S&W Mag (R) cases was built to use large pistol primer per Smith & Wesson and Cor-bon specifications. On July 28 2003 Smith & Wesson and Cor-bon changed specification of primer pocket to be large rifle. Rifle primers are same diameter as pistol except they are approximately .006 taller. This was done to prevent primer from being pierced by firing pin when loaded with max loads and heavy bullets (bullets over 400 grains).”