Perhaps I didn't make myself clear. I wasn't trying to imply that there is such a relationship, only that from what I have heard, the Fiocchi's pressures tend to run high. Ballistically, however, the Fiocchi and the NATO round seem to be nearly equal in performance.Okay, one more time.
There is no direct relation between velocity and pressure. Certainly, there is a perceived relationship, but that is only perception. You can have high velocity without necessarilly having +P pressures, and you can have +P pressure with a low, or 'normal' velocity.