P32 is much quieter (if you can say that) than the 22mag. FACT
I've never chron'ed my tiny 22mag revolver, but basically it is a controlled release of the powder. I'm betting on 700fps from the mini revolver- possibly the same as the 22lr version. A guess on my part.
32acp ball is a better round than most think, it is worthless (to me) with a hollow point bullet.