Winchester Unprimed Brass Cases 257 Roberts (50pk) Type_Ammo Boxes Their brass is comprised of

Their brass is comprised of 70% copper and 30% zinc and is vertically drawn during the manufacturing process which results in more uniform wall thickness

a combination of the their GMX and FTX bullet technologies

Weight Filled: 2

The professional choice for gunstock finishing

CCI-made and primed case

Winchester Unprimed Brass Cases 257 Roberts (50pk) Type_Ammo Boxes Their brass is comprised ofEach and every piece of Winchester brass is made to meet and exceed the most demanding quality control and performance standards in the industry. New, unprimed brass. This is not loaded ammunition. Technical Information Caliber: 257 Roberts Finish: Brass Preparation: Due to the manufacturing process and or shipping, case mouths may not be perfectly round. To ensure a round case mouth, cases must be sized (or have the expander ball of the sizing die