I use H335 behind a 32g Vmax, runs right around 4050 fps. I don't know what hornady superformance is claiming, but I'm guessing it's 4150-4200 fps.
Their superformance is always on the higher end, and everything I've read is that the superformance powder does not replicate the same numbers that the actual superformance ammo claims. That being said I would have to assume they are using a proprietary form of it.