Bertram Unprimed Brass Cases 284 Winchester (100pk)Bertram Brass produces high quality, consistent brass for those obscure and obsolete calibers. Proudly made in Australia, this brass was precisely manufactured to deliver excellent accuracy and longevity. 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