Anybody done any experimentation with high density tungsten strings?

A fiddle player I know has a five string fiddle with HDT for the low C string, because he can get the low pitch (like a viola) using a much thinner (and shorter) string than would be possible with conventional strings.

I don't know if such strings are readily available for guitarists, though I believe some people use them on bouzoukis, which would suggest they may be...

Just a thought...