Properly Grinding Small Grains | Grain Mill Wagon
· You could probably use our Wonder Junior hand grain mill with the steel burrs to grind mustard seed but we have never tried it before. Reply. Gary B says: September 25, 2013 at 8:27 am. I own a Wondermill Jr. It does an excellent job grinding, but when I use the steel burs to steel cut oats, the texture is a little to powdery. I tried different adjustments from fine to coarse but it goes from ...