20rds 357 Mag Corbon 140gr. HP Ammo For Sale. This is 357 Mag Corbon Hollow Point 140gr Ammunition. Corbon’s JHP ammunition has unparalleled stopping power. Their JHP loads have greater velocity and energy values than those of their rivals. The result will be a bullet that travels quicker, but upon contact, the hollow tip will expand into a mushroom form, spreading its energy throughout the target. Dissipation of energy is the cornerstone of COR-shown BON’s stopping power.