As Micky says a powder trickler trickles powder into the pan on the scales - this is different from a powder measure, which dumps a set volume of powder into the case.
I use the Lee scoops or plastic kitchen measuring spoons to put about, but not quite enough, powder into the pan (you can also use a powder measure to do this), then use the trickler to add granules until the scales are balanced. I used to do it by tapping a teaspoon but find the trickler easier and faster.
I have never used a turret press so feel free to ignore this bit
Several people have told me that turret presses have too much flex for full length sizing magnum cases. For non-magnum calibres they are probably fine. For most of my rifles I neck size rather than full length, which puts bugger all strain on the press.
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