Not knocking the .327, or them what likes 'em, but that was the thing with the .32 Mag Marlin I had.
Nice little gun, shot well, easy toting.
But, one day woke up, thought "Hmm. Got probably four thousand empty .357 brass for my trusty ol' 16-inch .357 Marlin, got at least 2500 empty brass for Bubbles' beloved .32-20 Marlins (both of them), loads of bullets for both calibers, no real use for the .32 Mag that's not covered by something else...." and sold it.
The .327's definitely a niche caliber, and if it fills a hole for you, great.
But, ammo's not all that common, or all that cheap, and the caliber's not all that popular.
I doubt there'll ever be a rifle market to speak of.
Denis