Doubletap Ammunition Defense 10mm Auto 230 Gr Jacketed Hollow Point/L. This loads offers 11.5" of penetration with .7" of expansion and EXTREME fragmentation throughout the wound channel. One of the most desturctive rounds on target produced to date in the 10mm. What about two shots in one? A 135gr. JHP over a 95gr. lead ball. This load is VERY accurate and produces two holes on target. Specifications for Doubletap Ammunition 10MM230EQ Defense 10mm Auto 230 Gr Jacketed Hollow Point/L: Manufacturer: Doubletap Ammunition Caliber: 10mm Auto Number of Rounds: 20 Bullet Type: Jacketed Hollow Point/Lead Ball Bullet Weight: 230 grain Cartridge Case Material: Brass Muzzle Velocity: 1050 ft/s Application: Self-Defense Primer Style: Centerfire