20rds 357 Sig Corbon 115gr. HP Ammo For Sale. This is 357 Sig Corbon 115gr. Hollow Point Ammo. Like no other, Corbon’s JHP loads have proven stopping power. Their JHP loads come loaded with higher velocity and more energy values then their competitors. What you’ll get is a bullet traveling faster, but on impact the higher velocity will cause the hollow point to expand into A mushroom shape dispersing its energy into the target. Energy dispersal is the key to COR-BON’s proven stopping power. This ammo is brass cased, boxer primed, non-magnetic, and non-corrosive. It comes packed in 20rd. boxes. Muzzle Velocity: 1500 fps. 20rds 357 Sig Corbon 115gr. HP Ammo For Sale.