Peterson 300 RUM unprimed brass cases offer premium quality for handloaders working with 300 Remington Ultra Magnum cartridges. These cases are manufactured to exacting tolerances for consistent performance.Peterson 300 RUM Unprimed Brass Cases50 pieces per packUnprimed - ready for your choice of primer300 Remington Ultra Magnum caliberPremium Peterson brass constructionSKU: 40070-RIdeal for precision handloaders and competitive shooters who demand consistent high-quality brass cases for their 300 RUM ammunition development.