I've yet to see what's different about it. The animal tests I've seen show that it's regular old high velocity low weight ammo. By the way, the #'s listed on the website are FALSE The penetration depths reflect the round in gel, where it doesn't fragment, while the cavity diameters reflect the round in animal tests, where it DOES fragment, but doesn't penetrate due to little retained mass. In other words, they're tying together two separate tests to make their ammo seem worthwhile. Of course it looks like it works, the wounds are massive in diameter, but the depth of them is less than impressive.