These come with Raptor Tips already installed. The Flat Base Raptors are manufactured out of solid brass bar stock on a CNC Swiss style lathe. Instead of mushrooming, these hollow points are designed so that after 1-2 of penetration, 6 blades break off and radiate outward in a start pattern while the base continues on for even deeper penetration. The required twist rate for this bullet is 1:10 or faster. A minimum impact velocity of 1500fps is required for the hollow point to function as intended. Technical Info: Caliber: .308 Weight: 150 grains Required Twist Rate: 1:10 or faster G1 Ballistic Coefficient: TBD OAL: 1.484 Projection Length: Blackout: .860, Win: .765 Min Impact Velocity Required for Expansion: 1500fps