The tubes do help, as my edited in photo shows, above. The more space between grains, the more help. There is a trick though, and that is to be sure the drop tube is plumb to give the grains the greatest velocity without bumping the sides on the way down. I find it best to put a long drop tube, like the 3' tube on a chemists glass apparatus stand, so I can set the rod plumb and not have to fiddle with it. If your rod is an extension of the powder measure, leveling feet or shims under the base can help get the tube vertical.
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Last edited by Unclenick; June 21, 2011 at 02:41 PM.