You will get different answers depending on who you talk to.
As far as I am aware, the 250hrs thing is for aircraft over 12500lbs.
My company has taken on a few guys with less than 250hrs on type, some with 0 time, and they have had no issues for the caravan.
The one limitation that is in place is 1000hrs Single Engine time to go captain on the van.
If this isn't a bush operation, then I don't really know what is? Unless you want to be picky and call it a jungle mountain operation.