HSM Ammunition Starline Rifle Brass Unprimed Cases 500 S&W Mag Caliber Handgun Brass 50 Per Bag. 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). Specifications for Starline Brass Unprimed Cases 500 S&W Mag Handgun Brass: Manufacturer: HSM Ammunition Gun Type: Rifle Caliber: .500 S&W Magnum Primed: No Quantity: 50 Fabric/Material: Brass Package Contents: Starline Brass Unprimed Cases 500 S&W Mag Handgun Brass