Designed for hunting, self-defense and law enforcement, Hornady XTP 10mm 155-Grain Hollow Point Handgun Bullets feature a cannelure to help achieve accurate, consistent crimping and varying jacket thickness to control expansion down the length of the bullet. Precise serrations divide the XTP® into symmetrical sections, strategically weakening the jacket and initiating controlled expansion, even at low velocities. Hornady XTP 10mm 155-Grain Hollow Point Handgun Bullets - Reloading at Academy Sports