Sierra Tipped MatchKing Bullets (TMK) 30 Caliber (308 Diameter) 168 Grain Polymer Tip Boat Tail (100Pk). 30 Caliber 7. 62mm (. 308) 168 gr. Tipped MatchKing (TMK) Sierra has enhanced a segment of the MatchKing line by adding the acetal resin tip, thus crowning the Tipped MatchKing (TMK) bullet line. The major advantage of adding a tip to the bullet is the reduction of drag, producing a more favorable ballistic coefficient. Due to the decades of dominance of our 168 grain MatchKing (#2200) in our . 30 caliber bullet line, including it in the new Tipped