Unique is a top-performer in .380. It doesn't measure any better than Red Dot, except you'll be using more of it and that cuts down on the error quite a bit.
Bullseye or 231 are appropriate powders for .380 and they measure much better than any of the "Dot" powders or Unique. Universal is almost as good as Unique, is cleaner, and measures better.
Not sure exactly what you are going for... What bullets are you using? (when I reload .380's I use 95 grain hard lead cast bullets.)
"The only way to stop a bad guy with a gun is with a good guy with a gun"