Our 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 1:10 or faster. Technical Info: Caliber: .308 Weight: 180 grains Required Twist Rate: 1:10 or faster G1 Ballistic Coefficient: .478 G7 Ballistic Coefficient: .245 OAL: 1.445 Projection Length: .785 Min Impact Velocity Required for Expansion: 1700fps