MTH line is machined out of lead free solid copper bar stock on a CNC lathe. These are a high BC, expanding bullet designed for hunting at all ranges. A unique feature of this bullet is our patented SealTite band which is a band slightly larger than caliber diameter around the bullet which was designed to eliminate fliers by preventing gas blow-by. The SealTite band also decreases copper fouling which is typically associated with mono metal bullets. These bullets do not mushroom, but instead, fracture. After 1-2" of penetration, 3-4 petals will break off and radiate outward from the main wound channel about 2-3" creating massive trauma. They will expand down to 1600fps. The required twist rate for this bullet is 1:9"or faster. This Match Tactical Hunting bullet was designed for magazine feeding in all rifles especially the popular AR-15. More Information: Formerly MTH B55 Material: Copper, Lead Free Caliber: .224 OAL: .869" Weight: 55 grains G1 Ballistic Coefficient: .250 Projection Length: .500" Required Twist Rate: 1:9" or faster Caliber: .264/6.5mm OAL: 1.313" Weight: 120 grains G1 Ballistic Coefficient: .490 G7 Ballistic Coefficient: .246 Projection Length: .804" Required Twist Rate: 1:9" or faster Caliber: .264/6.5mm OAL: .1.389" Weight: 130 grains G1 Ballistic Coefficient: .550 Projection Length: .720" Required Twist Rate: 1:7" or faster