Starline Brass Unprimed Cases Winchester 100/Pack. This cartridge can also be formed into .25-20 .218 Bee and with special forming dies available from RCBS and Lee you can form a shortened version of the 7.62 Nagant cartridge. Specifications for Starline Brass Star3220EUP1 Unprimed Cases 32-20 Winchester 100/Pack: Manufacturer: Starline Brass Gun Type: Pistol Caliber: .32-20 Winchester Fabric/Material: Brass Brass Quantity: 100 Piece Length: 1.280 - 1.286 in