What DM~ said.
In addition, these are very different platforms. Your .30-30 will easily take a deer out to 200 yards; I wouldn't want to go past 100 with a .357, but that's me. I have and very much like my 24, but it's a .22mag/20 and is clearly intended for varmint and small game; it is excellent in that capacity. Much as I like the idea of a .357/20 combo as a novelty, I would have no use for it. So be clear on what your intended use is before pulling the trigger.