Sierra Bullets Tipped Gameking .30 Caliber 180 grain Boat Tail Tipped Rifle Bullets 500 Bullets. Their shapes include hollow point boat tail (HPBT) spitzer boat tail (SBT) and full metal jacket boat tail (FMJBT). medium to heavy weights in each caliberWith their boat tail shapes GameKing bullets have high ballistic coefficients retain their velocities well and resist crosswinds and vertical winds well as they fly Designed for a combination of penetration and expansion in medium and heavy game animals for their calibersTipped - a synthetic tip integrated into the bullet design to improve ballistic coefficient(BC) /aerodynamics and providing expansion characteristics. Specifications for Sierra Bullets Tipped Gameking .30 Caliber 180 grain Boat Tail Tipped (BTT) Rifle Bullets: Manufacturer: Sierra Bullets Gun Type: Rifle Bullet Weight: 180 grain Projectile Caliber: .30 Caliber Country of Origin: USA Features of Sierra Tipped GameKing 180 gr. .30 Cal BTT Rifle Bullets Optimal jacket wall thickness controls expansion and retains weight Open pocket under the polymer tip expands lead core instantly on impact Tuned ogive for industry-leading BC Boat tail design for stable flight and accuracy Package Contents: Sierra Bullets Tipped GameKing 180 gr. .30 Cal BTT Rifle Bullets Sierra Bullets 4680C: Tipped GameKing Rifle Bullets .30 Caliber Boat Tail Tipped BTT 180 grain 500 Rounds/Box