First off, the guns are not "made of Scandium".
Scandium is worth $7,000 per pound. S&W isn't selling "Scandium guns".
Trace amounts of Scandium are being used to improve an Aluminum alloy. The improvements seem to be real, but it's questionable whether they've hit the strength of Titanium yet.
The Taurus 27oz .357 7-shot TI seems to be a saner alternative, esp. with a ported 4" barrel. I wouldn't want to shoot the Taurus TI 5-shot .357 snubbie either, that's about 19oz, right? A 12oz version in Aluminum-Scandium alloy would be nuts.
How well are the recent Taurus wheelguns holding up?
Jim