Speer .400 Pistol Bullets 155 Grain Total Metal Jacket 100 Bullets. With a Uni-Cor construction Speer 4399 TMJ Handgun Bullets are manufactured with a molten lead core that is poured into the copper jacket thereby eliminating the base of the bullet from deforming under pressure. These bullets are swaged twice to ensure a uniform heel and consistent diameter from shot to shot. Since the base of the bullet does not experience deformation while under pressure you can be sure that Speer TMJ Handgun Bullets will perform admirably in all situations. Specifications for Speer .400 Pistol Bullets 155 Grain Total Metal Jacket: Manufacturer: Speer Bullet Type: Full Metal Jacket (FMJ) Bullet Weight: 155 grain Sectional Density: 0.138 Projectile Caliber: .400 Caliber Bullet Quantity: 100 Bullet Fabric/Material: Copper Features of Speer TMJ Handgun Bullet .400 155 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 .400 155 Grain Total Metal Jacket Pistol Bullet Speer 4399: .400 Pistol Bullets 155 Grain Total Metal Jacket 100 Bullets