Cheap tungsten bullets for everyone?
Maybe cores, straight up, the barrel wear would be frightful.
Yikes. Rare or not, tungsten is really hard. It would tear up the barrel in short order. Maybe as a jacketed slug, as is already being done (and the benefit there would be the lower cost), since it is close to lead in weight.
Also, just because tungsten and titanium and other similar metals are about to get cheaper, doesn’t mean they’re not still insanely expensive to work with. Both metals require complex tools to work, and very high temperatures for forging.