Most of the published data for 30 Carbine is for 296/110 or powder very close on the burn rate chart. Looking at case capacity, 32-20 seems close enough to make some civilized loads for a revolver chambered in 30 carbine. One could avoid some of the blast and flash by using less of a faster powder.
Now, What if some of the 32-20 recipe handloads made their way into a carbine? Would they damage it, or just cause malfunctions?