I decided to whip up an air gauge for pellets this morning. With a bit of creativity and some hardware bits and pieces, easily done.
Air gauging has been around since the 30's and is extremely accurate and consistent. It's also easy...no magic involved, just basic physics involving air back pressure.
Make up a master sizer like below, set it up in the air gauge and start gauging.
i have some videos of it in operation. Works like a charm. Sizing pellets is quick and easy.