This is Hornady 9mm 147-grain subsonic hollow-point ammo equipped with the Hornady® XTP® bullet.

More about Hornady XTP Subsonic ammunition: 

Hornady® Subsonic Ammunition — designed for accuracy and performance below the speed of sound — now comes in both rifle and handgun loads.

Subsonic Handgun utilizes tried-and-true XTP® bullets that expand reliably at subsonic velocities. The Sub-X bullet used in Subsonic Rifle features a lead core. 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.

Powders are selected for optimal performance and consistency from lot to lot.