Action Fit: Bordon Rimrock,BRNO,Browning A-Bolt,Cooper 22,Cooper 54,Cooper Model 16,CPS,Dakota Arms,Enfield US M1917,GA Precision Templar,Grunig Elmiger,H-S Precision,Hart Actions,Herter Model V9,Husqvarna Model HVA & M8000,Mauser 3000,Stillar Viper Bolt Diameter: .695 Cartridge: 221 Remington Fireball,222 Remington,222 Remington Mag,223 Remington Delivery weight: 0.091kg