Weatherby Select Plus Unprimed 6.5mm Weatherby RPM Rifle Brass 50 Piece. 5-300 Wthby Mag Rifle Brass - Weatherby Magnum Ammunition features Precision Brass. Features CNC-machined primer pockets produced to match-grade specifications. Available for all Weatherby Magnum calibers. Specifications for Weatherby Select Plus Unprimed 6.5mm Weatherby RPM Rifle Brass: Manufacturer: Weatherby Fabric/Material: Brass Weatherby Unprimed Cases 6.5-300 Wthby Mag Rifle Brass BRASS653CT50 Weatherby BRASS65RPM50CT: Select Plus Unprimed 6.5mm Weatherby RPM Rifle Brass 50 Piece