Underwood Ammo Xtreme Defender Features The Underwood Ammo Xtreme Defender uses a 65 grain solid copper Lehigh Defense bullet loaded to a muzzle velocity of 2100 fps in .357 Sig a combination designed around fluid dynamics rather than a traditional hollow point cavity. As the bullet meets tissue its flutes channel fluid forward to force consistent reliable expansion regardless of what barrier the bullet may have passed through first. This design means the round performs the same whether it strikes bare tissue or has first passed through heavy clothing drywall or other common intermediate barriers. The light 65 grain weight combined with the high velocity gives the round a flat trajectory and significant terminal energy on impact. Because the bullet is a solid copper monolithic design there is no jacket to separate from a lead core eliminating a common failure point of traditional expanding defensive ammunition at high velocity. Shooters carrying a .357 Sig pistol for self-defense gain a round that is engineered specifically to perform consistently across a wide range of real-world defensive scenarios. Underwood Ammo has built its reputation on pushing lightweight projectiles to higher velocities than typical factory loads giving shooters more aggressive performance from their existing firearms. This Underwood Ammo Xtreme Defender load is available for sale at GrabAGun for shooters who want dependable barrier-blind defensive performance in .357 Sig. Underwood Ammo Xtreme Defender Specifications Manufacturer: Underwood Ammo Model: Xtreme Defender Caliber: .357 Sig Bullet Weight: 65 Grain Bullet Type: Copper Solid Velocity: 2100 FPS Rounds Per Box: 20 Available At: GrabAGun