Ammo Specifications Caliber: 10mm Auto Bullet Weight: 180 Gr. Bullet Type: XTP (Extreme Terminal Performance) Quantity: 20 Rounds This Hornady Custom pistol ammo is loaded with the famous Hornady XTP (Extreme Terminal Performance) bullet. XTP bullets are supremely accurate, and deliver maximum knockdown power. Each cartridge is loaded to ensure optimal pressure, velocity and consistency from lot to lot. Like the powder, each primer is carefully matched to individual loads, and specifically selected for their ability to quickly, completely, and reliably ignite the powder charge.