If you really think the .30Carbine is a better solution, you're not looking very hard. Because the only revolver chambering the .30M1 is the large frame Blackhawk. The .327 works in a Single Six and is far more useful in that platform. The rim makes things easier than the .30. The straight wall makes things easier than the .32-20. I don't know where the comments about bullet selection come from. There is a boatload of .32 bullets available. From swaged wadcutter and semi-wadcutter plinkers to 85gr and 100gr JHP's from Speer and Hornady, plenty of cast bullets up to 130gr and the new 115gr Gold Dot. They also have a handy cannelure for proper crimping in BOTH sixgun and rifle. Marlin has already produced their 1894 in .32H&R and .32-20 so all is needed is a slight alteration to allow the .327. You can also shoot five different cartridges in a .327 sixgun, including the .32S&W, .32S&W Long, .32ACP, .32H&R and .327Federal.
Every way you look at it, the .327 is a better solution, IF you have an open mind.