I mean the market is the same guys that buy lever actions to compliment their revolvers.
I mean the range is the same as any PCC. As for cost, I could see it being 600 bucks if you went all in on polymer. The no glock mags thought WOULD be a hard sell. The mags would have to be proprietary.
The advantage is you can use your horde of 38 special or whatever revolver round you have in a semi auto rifle. The options for using 38 special or 357 magnum are basically either wheelguns or lever actions. A semi auto option would be nice.
It would be targeting a niche, but I think it could be profitable. It would make a person's 1000+ round horde of wheelgun ammo a bit more of a useful investment.
They could plink with 38 special, then hunt with 357 in the same gun. Unlike 300 blk or 7.62x39mm, the cost is variable between those rounds. Buy the cheap 38 special to plink with, and a small amount of 357 to hunt with/ home defense. I think it's economical in that sense.