HSM Ammunition Pro Pistol 10mm Auto 180 Grain Jacketed Hollow Point Brass Cased Pistol Ammo 20 Rounds 10MM15N20. The Pistol Pro ammo features premium jacketed Sierra bullets which is ideal for reliability and accuracy you can trust. Specifications for HSM Ammunition Pro Pistol 10mm Auto 180 Grain Jacketed Hollow Point Brass Cased Pistol Ammunition: Manufacturer: HSM Ammunition Caliber: 10mm Auto Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 180 grain Cartridge Case Material: Brass Primer Style: Centerfire HSM Ammunition 10MM15N20: Pro Pistol 10mm Auto 180 grain Jacketed Hollow Point Brass Cased Pistol Ammo