Handguns cartridges in carbines
Leverguns has some velocity comparisons between handguns and rifles in the same caliber. If you're a revolver guy, it gives another reason for choosing a magnum and levergun over a semi-auto.
The 9mm rarely gains more than 100 fps out of a long barrel. Revolver rounds gain much more. Check out the 125gr. Gold Dot loading from Buffolo Bore : 1603 fps out of a four inch revolver and 2298 fps out of a carbine.
I posted about that before here.