Corbon Ammo Self Defense, 357MAG, 140 Grain, Jacketed Hollow Point, 20 Round Box 357140 COR(R)BON JHP(TM) is the traditional hollow point that put COR(R)BON on the map. JHP(TM) 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.