Cloud seeding in Tasmania was done at one stage in a local Mojave or a P Navajo. The contract went to Kevron Aerial Surveys, I think in the late 90s, and they used a Cessna Conquest. I don't remember the registration, but I do remember the fuss from Strahan/Queenstown residents who wanted to suit Hydro Tas for scaring away people with the extra rain and aledgedly ruining the tourism industry.
Was VH-FJW, a C320, used for survey?