Already with you, Wogpotter! I have a series of Tupperware containers marked out with the various powders I use, and I dump enough powder to immerse the scoop into them at the start & then return it to the primary container when I'm done. Saves reaching down into the tin of whatever-it-is, and if I do something dimwitted and knock something over, I haven't lost my entire stock of [insert powder name here].
Have decided to go, if not for broke, at least for higher loads than scoop-provided minimum. So the scoop will now be there to get the bulk of the charge onto the scale, and then I'll be following on with the powder trickler. Nevertheless, rapidly-produced practice ammo will still be called for at some point, so I'll keep your technique in mind and try it out. Cheers.