I have done this.
I have run commercial ammo through the crony in revolvers with 38 special and 357 magnum from 2 through 8 3/8" barrels.
I have also run this same ammo from a Winny 94 and gained anywhere from 50-500ft/sec from the handgun to the carbine.
There is no hard fast rule but most commercial ammo will gain 2-400ft/sec when shot out of the carbine compared to a 4" revolver or the velocity shown on the box.
If you reload there is a ton of data from Speer, Hodgdon etc for carbine/rifle loads in the 357 and 44 mags.
Most of these loads are too hot for a revolver, so you need to keep your ammo seperated so you don't accidently use it in a handgun. These loads will gain you 2-500 additional ft/sec over factory ammo in a carbine/rifle.
125's in a carbine/rifle at almost 2300ft/sec which is almost 1000ft/sec faster than some lower pressure factory loads out of a revolver.
