Sierra Bullets .264 Caliber 150 Grain HPBT MatchKing 500 Rifle Bullets. This 6.5mm 150 grain Hollow Point Boat-Tail Rifle Bullet has a sleek 27 caliber elongated ogive with a final meplat reducing operation (pointing). Upon impact this rifle bullet expands to provide six times the energy of a similar bullet noting a devastating effect on game. This Sierra Bullet is recommended for most 6.5mm applications including sniper rifles built with a twist rate of 1:7.5 or faster. These 6.5mm MatchKing Bullets are designed for medium velocity and standard twist rate for maximum accuracy and consistency. Although these bullets are commonly used for varmint hunting they are not recommended for most hunting applications. Although these bullets are commonly used for varmint hunting they are not in the same ballistics class as the lightly jacketed Hornet Blitz or Varminter models. Specifications for Sierra Bullets .264 Caliber 150 Grain HPBT MatchKing 500 Rifle Bullets: Manufacturer: Sierra Bullets Bullet Type: Hollow Point (HP) Boat Tail Hollow Point (BTHP) Bullet Weight: 150 grain Projectile Caliber: .264 Caliber Sectional Density: 0.307 Bullet Quantity: 500 Bullet Barrel Twist Rate: 1-7.5 Country of Origin: USA Fabric/Material: Copper Package Contents: Sierra Bullets 1755C MatchKing 6.5mm .264 150 GR Hollow Point Boat Tail (HPBT) 500 Box Sierra Bullets 1755C MatchKing 6.5mm .264 150 GR Hollow Point Boat Tail HPBT 500 Box