This bullet is designed to function at subsonic speeds and put game on the ground quickly and quietly. This makes it an excellent choice for 8.6 Subsonic rifles. A minimum impact velocity of 800fps is required for the hollow point to function as intended. Instead of mushrooming, our subsonic Raptor bullet sheds 4 large blades after about 1-2 of penetration while the base continues. It is manufactured out of solid copper bar stock on a CNC Swiss style lathe. The minimum required twist rate for this bullet is 1:7 or faster. Technical Info: Caliber: .338 Weight: 345gr Required Twist Rate: 1:7 or faster G1 Ballistic Coefficient: G7 Ballistic Coefficient: OAL: 2.209 Projection Length: 1.120 Min Impact Velocity Required for Expansion: 800fps