Magtech Brass Shotshell hulls are ideal for traditional black powder loads. Mix 10 boxes of any guage to receive case pricing. When choosing wads for brass cases, choose one gauge larger for proper fit: For example, use 11-gauge cards in a 12-gauge brass case. Magtech brass shells use large pistol primers. Firearm Chamber Length=2 1/2". Brass Case Length=2.36". No loading data available at this time. 25 rounds per box 10 boxes per case