The ER (Extended Range) Raptor is a tipped hollow point design and is intended for long-range hunting out to 600yds. Instead of mushrooming, our Raptor bullets are all designed to shed 6 blades after 1-2 of penetration while the base continues for even deeper penetration. A minimum of 1500fps impact velocity is required for the hollow point to function as intended. This bullet has a required twist rate of 1:12 or faster. These bullets come with Raptor tips installed. Technical Info: Caliber: .308 Weight: 135 grains Required Twist Rate: 1:12 or faster G1 Ballistic Coefficient: .355 OAL: 1.377 Projection Length: .787 Min Impact Velocity Required for Expansion: 1500fps