Shooters around the world will appreciate the accuracy and extreme long range performance of Sierra's 7mm 183 grain HPBT (#1983). A sleek 27 caliber elongated ogive and a final meplat reducing operation (pointing) provide an increased ballistic coefficient for optimal wind resistance and velocity retention. To ensure precise bullet to bore alignment and a unique bearing surface to ogive junction uses the same 1.5 degree angle commonly found in match rifle chamber throats. -This is not loaded ammunition. -Requires a barrel twist rate of 1x8" or faster. Technical Information: Caliber: .284 and 7mm Bullet Diameter: .284" Bullet Weight: 183 Grains Bullet Style: MatchKing Hollow Point Boat Tail Bullet Coating: Non-Coated Ballistics Information: Sectional Density: .324 Ballistic Coefficient: .713