Cutting Edge Bullets Match Tactical Hunting .243/6mm Caliber 77 Grain Solid Copper Hollow Point Rifle Bullets 50 Rounds MTH 243 77. These Rifle Bullets by Cutting Edge Bullets have a SealTite band which is slightly larger than caliber diameter and is designed to eliminate fliers. The Cutting Edge Bullets MTH Crossbow Bullet features a 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. These bullets do not mushroom but instead fracture after 1-2" of penetration. For a tighter twist rate the Cutting Edge Bullets MTH Bullets have a 1:10" twist rate. The cutting-edge Bullets Hydrostatic Lube Copper Hunting Bullet will penetrate down to 1600 fps and the required twist rate is 1:10" or faster. Specifications for Cutting Edge Bullets Match Tactical Hunting .243/6mm Caliber 77 Grain Solid Copper Hollow Point Rifle Bullets: Manufacturer: Cutting Edge Bullets Gun Type: Rifle Bullet Type: Copper Expansion Projectile Caliber: .243 Winchester Cartridge Type: Rifle Bullet Weight: 77 grain Projectile Caliber: .243 Caliber Diameter: 6 mm G1 Ballistic Coefficient: 0.37 Core Material: Lead Jacket Material: Copper/Lead Free Bullet Quantity: 50 Bullet Package Contents: Cutting Edge Bullets Match Tactical Hunting .243/6mm Caliber 77 Grain Solid Copper Hollow Point Rifle Bullets Cutting Edge Bullets MTH 243 77: Match Tactical Hunting .243/6mm Caliber 77 Grain Solid Copper Hollow Point Rifle Bullets 50 Rounds