Berry's Superior Plated Bullets are swaged and plated to final weight and re-struck foraccuracy and precision. They are more affordable than jacketed rounds and won't foulyour 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. *Note- SAAMI MAX 9mm COL = 1.169.