Cutting Edge Bullets Match Tactical .40/10mm Caliber 395 Grain Solid Copper Match Rifle Bullets 50 Rounds MTAC 408 395 MAX. Their MTAC line is machined out of lead free solid copper bar stock on a CNC swiss lathe. These are a high BC solid bullet designed exclusively for target use at all ranges. A unique feature of this bullet is their 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. Specifications for Cutting Edge Bullets Match Tactical .40/10mm Caliber 395 Grain Solid Copper Match Rifle Bullets: Manufacturer: Cutting Edge Bullets Gun Type: Rifle Bullet Type: Copper Expansion Projectile Caliber: .40 S&W Cartridge Type: Rifle Bullet Weight: 395 grain Projectile Caliber: .408 Caliber Diameter: 0.408 in G1 Ballistic Coefficient: 0.9 G7 Ballistic Coefficient: 0.376 Core Material: Lead Jacket Material: Copper/Lead Free Bullet Quantity: 50 Bullet Barrel Twist Rate: 1-13 Fabric/Material: Copper Package Contents: Cutting Edge Bullets Match Tactical .408 Caliber 395 Grain Solid Copper Match Rifle Bullets Cutting Edge Bullets MTAC 408 395 MAX: Match Tactical .40/10mm Caliber 395 Grain Solid Copper Match Rifle Bullets 50 Rounds