Corbon Ammo Self Defense, 9MM, 90 Grain, Jacketed Hollow Point, +P, 20 Round Box 990 CORBON JHP is the traditional hollow point that put CORBON on the map. JHP is proven ammunition that provides reliable penetration and expansion. The internal and external serrations and soft lead cavity provide stopping power and an average penetration of 9 to 15 inches in ballistic gelatin.