Underwood Maximum Expansion Features The Underwood Maximum Expansion load is built around a 140 grain Lehigh Defense copper solid bullet a projectile design engineered to expand consistently without relying on a traditional jacket and lead core construction. Loaded to 1050 fps this .40 S&W round is tuned to balance controllable recoil with the velocity needed to drive reliable expansion at typical defensive engagement distances. The all-copper construction eliminates jacket separation concerns that can affect traditional hollow point designs under certain velocity and barrier conditions. This solid-copper approach reflects Underwood s focus on specialized performance-oriented defensive ammunition rather than standard training loads. Packaged 20 rounds to a box this load is sized appropriately for shooters replenishing a carry rotation or testing a new defensive round through their .40 S&W pistol. Underwood specializes in producing ammunition tailored to shooters seeking specific terminal ballistics rather than mass-market generic loads and the Lehigh Defense partnership reflects that focus on purpose-built defensive performance. Shooters carrying a .40 S&W pistol for personal protection may find this combination of solid-copper construction and tuned velocity a worthwhile addition to their carry ammunition options. For those seeking a specialized defensive round in .40 S&W Underwood s Maximum Expansion load delivers a distinct terminal performance profile. Underwood Ammo Maximum Expansion Specifications Brand: Underwood Ammo Caliber: .40 SW Bullet Weight: 140 gr Bullet Type: Copper Solid Velocity: 1050 fps Rounds Per Box: 20 Available At: GrabAGun