My experience is that I can not meter it well. I am using a Lee Auto Drum. For my light loads of .357 I want to be around 4.1 grains. I get the occasional drop to 4.3 and some at 4.0. I had the sticky expander and thought maybe the powder measure was the fault. I bought a RCBS uniflow with the small drum and micrometer. Set it up last night, ran a full can of Blue Dot through it as the instructions suggested, followed with a container of Trail Boss. Then I set it for 4.1 grains and tried weight maybe 20 loads. Looks about like what I was getting with the Lee. I guess I am a little disappointed but not surprised. I bought a Redding expander die also so I will try a box with the new expander (which seems to do a nice job) and the Uniflow . I sorta wanted one of those anyway but might not use it regularly if it is no more consistent than the AutoDrum and the sticky extractor. So my questions are: How do you throw Trail Boss and how accurately can you do it. Am I about right or missing something that will help? Another question is does .2 grain variation make any appreciable difference with Trail Boss? The grain vs velocity curve is so flat it looks like it might not.