Speer TMJ Handgun Bullet .357 158 Grain Total Metal Jacket Pistol Bullet 100. 357 158 GR Total Metal Jacket (TMJ) 100 Box - To ensure the consistency you need in your reloads Speer has incorporated a uni-cor differentiator into its TMJ bullet design. This distinction means that the base of the bullet which is the weak point of many competing bullets will never under any circumstance deform under recoil. Both jacket and core are made from 100 percent molten lead which produces the Uni-Cor process in which molten lead is poured into a pre-formed steel core. Uni-Cor is a revolutionary process in which molten lead is poured into a casing that cools inside the jacket before being drawn into the press to form the raw material of the bullet. This virtually eliminates the possibility of deformation or delamination at the base of the bullet. You can rest assured that when you use Speer TMJ bullets you will experience "tumble" upon impact due to the bullet's flexed metallic jacket. Plus these bullets will not foul patented recoil compensators. For reliable uniform and powerful performance you can count on rely on the Speer TMJ. Specifications for Speer TMJ Handgun Bullet .357 158 Grain Total Metal Jacket Pistol Bullet: Manufacturer: Speer Bullet Type: Full Metal Jacket (FMJ) Bullet Weight: 158 grain Sectional Density: 0.177 Projectile Caliber: .38 Caliber Bullet Quantity: 100 Bullet Fabric/Material: Copper Features of Speer TMJ Handgun Bullet .357 158 Grain Total Metal Jacket Pistol Bullet Uni-Cor technology completely encases the lead core in a seamless jacket Design eliminates the accuracy-robbing features of conventional full metal jacket bullets Reduces fouling and airborne lead Consistent bullet diameters and a uniform heel Package Contents: Speer TMJ Handgun Bullet .357 158 Grain Total Metal Jacket Pistol Bullet Speer 4207: TMJ Handgun Bullet .357 158 Grain Total Metal Jacket Pistol Bullet 100