Berry's Manufacturing Superior Plated Handgun Bullets .40 S&W/10mm .401in 155 gr HBFP 1000/ct. They are more affordable than jacketed rounds and won't foul your barrel with lead.Berry's Superior Plated hollow base bullets are designed for shooters who need increased accuracy. 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 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 .40 COL = 1.135"SAAMI MAX 10mm COL = 1.250"Can withstand velocities up to 1250 fps Specifications for Berry's Manufacturing Superior Plated Handgun Bullets .40 S&W/10mm .401in 155 gr HBFP: Manufacturer: Berry's Manufacturing Bullet Type: Hollow Base Round Nose Projectile Caliber: .40 Caliber Bullet Quantity: 1000 Bullet Package Contents: Berry's Manufacturing Superior Plated Handgun Bullets .40 S&W/10mm .401in 155 gr HBFP Berry's Manufacturing 44572: Superior Plated Handgun Bullets .40 S&W/10mm .401in 155 gr HBFP 1000/ct