Berrys Superior Pistol 9mm .356 124 GR Hollow Base Round Nose Thick Plat. They are more affordable than jacketed rounds and won't foul your barrel with lead.Berry's Superior Plated hollow base thick plate bullets are designed for shooters who need increased accuracy and higher velocities. The hollow base allows the bullet profile to be longer and provides more contact area with the barrel and rifling to stabilize the bullet and improve accuracy. The thick plate allows the bullet to handle up to 1500fps. The bullet profile is longer but the weight remains the same and you can load these bullets using any published load data for a jacketed bullet as long as it is the same weight bullet.SAAMI MAX 9mm COL = 1.169"SAAMI MAX .38 Super COL = 1.280"SAAMI MAX .357 Sig COL = 1.140"Can withstand velocities up to 1500 fps Specifications for Berrys 15143 Superior Pistol 9mm .356 124 GR Hollow Base Round Nose Thick Plat: Manufacturer: Berry's Manufacturing Bullet Type: Hollow Base Round Nose Thick Plate Bullet Weight: 124 grain Condition: New Projectile Caliber: .355 Caliber Bullet Quantity: 250 Bullet Fabric/Material: Copper Package Contents: Berrys 15143 Superior Pistol 9mm .356 124 GR Hollow Base Round Nose Thick Plat Berrys 15143 Superior Pistol 9mm .356 124 GR Hollow Base Round Nose Thick Plat