HSM Ammunition Starline Pistol Brass Unprimed Cases 10mm Caliber Auto Handgun 100 Per Bag. 40 S&W. Now making a comeback this .40" caliber handgun is more powerful than the .45 Auto with higher magazine capacity. Specifications for Starline Brass Unprimed Cases 10mm Auto Handgun Brass: Manufacturer: HSM Ammunition Gun Type: Pistol Caliber: 10mm Auto Primed: No Quantity: 100 Per Bag Fabric/Material: Brass Package Contents: Starline Brass Unprimed Cases 10mm Auto Handgun Brass