Winchester Unprimed Brass Cases 44 Remington Magnum (100pk)Winchester makes the highest quality brass available, and each and every piece 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. 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 run through case