Corbon JHP and Corbon DPX have two very different bullets.
The JHP was a standard, non-bonded, lead core jacketed bullet driven at high speed. The testing I witnessed six years ago in a 10' vertical water tank could not accurately measure penetration, but the bullet came apart unevenly which often indicates shallow penetration. Retained weight of the core was around 70%. This is one of Corbon's less expensive loads. Corbon may have a new bonded JHP bullet that performs better.
On the other hand, Corbon was one of the first loaders to make up effective loaded ammo using the Barnes all copper XPB pistol bullets. These expensive rounds pass all manner of testing with top marks. Corbon came up with its own moniker, Deep Penetrating X bullet, or DPX. Barnes now markets the same bullets as their TAC-XP, and about a half dozen other companies have similar loads, including Barnes' own TAC-XPD ammo.