All Sierra GameKing bullets are for hunting and all have boat tails. 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 calibersSpitzer is a term taken from a German word that means sharp pointed. The spitzer shape is readily identified by a characteristic long ogive point shape closing with either a small diameter exposed lead tip or with the proprietary compound tips.