HSM Ammunition Starline Pistol Brass Unprimed Cases 45 Auto Rim Caliber 50 Per Bag. 45 Auto Rim has an extra thick rim that allows it to be used without a moon clip in revolvers designed for .45 Auto/moon clip combination. It is built with the same integrity as our 45 Colt case. This case will not work in single action revolvers chambered for .45 Auto(such as the Ruger Blackhawk with .45 Auto cylinder). Specifications for Starline Brass Unprimed Cases Handgun 45 Auto Rim: Manufacturer: HSM Ammunition Gun Type: Pistol Caliber: .45 Auto Rim Primed: No Quantity: 50 Fabric/Material: Brass Package Contents: Starline Brass Unprimed Cases Handgun 45 Auto Rim