Hornady 91369 Subsonic 40 S&W 180 Gr XTP Hollow Point 20 Bx/ 10 Cs Subsonic Handgun Utilizes Tried-And-True XTP Bullets That Expand Reliably at Subsonic velocities. Long grooves In Its Gilding Metal Jacket Combine With The bullet's Flat Profile And The patented Flex Tip Insert Within Its hollowpoint Cavity To Help It Expand Reliably at Low velocities. Caliber: 40 S&W Bullet Type: XTP Hollow Point Bullet Weight: 180 Gr Muzzle Energy: 361 ft Lbs Muzzle Velocity: 950 Fps Rounds Per Box: 20 Boxes Per Case: 10 Application: Hunting Casing Material: Brass