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5.56 77GR Bone Frog Ammunition™ Sierra Tipped MatchKing (TMK) A high performing 5.56 77gr TMK - made in the USA. 

Bone Frog Ammunition has added another excellent 77gr TMK option to the market. 

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. Another benefit is reliable feeding in magazine fed firearms. The 77 grain Tipped MatchKing (TMK) allows seating to an OAL that permits cartridges to be loaded into M16/AR15 magazines

Manufacturer - Bone Frog Ammunition
Ballistic Coefficient: 0.420 G1 | .207 G7
Bullet Weight -77GR 
Bullet Type - Sierra Tipped MatchKing (TMK)
Case Type - Brass
Muzzle Velocity - 2750 fps
*Recommended barrel twist rate of 1×8” or faster.