Ya know, if the Taurus 856 was designed and rated for 357 mag pressures using adequate metallurgy, why didn't they just chamber it in 357 mag so those inclined could use 38 special or 357 mag?

The answer may be pretty simple, they only designed it to take 38 plus p pressure and force.

Course if someone just thinks it "appears" sturdy, why not just be a tougher guy and load it to 357 mag pressures? And it is not the brass design as much as the firearm design in 357 to take the pressure and force of the round.

S&W (among others) make small light 357 mags, and they aren't just 38 specials with bored out cylinders. They are specifically designed to take 357 mag pressures/forces. So perhaps instead of supercharging a 38 special, just buy a 357 mag.