Powder Feed Tube Discoloration

Do you have trouble seeing through your powder measure hopper? Certain smokeless powders, particularly those with high percentages of nitroglycerin, can cause discoloration (yellow-brown-green) in the clear plastic powder measure / hopper tubes. Powder left in the tube over a long period of time makes the discoloration worse. 

The easiest way to keep the tube from discoloring is to store your powder in the original container when not loading, instead of leaving it in the tube until the next time you may reload. Normal usage during the reloading process does not provide adequate time for discoloration to occur. So simply draining your hopper into the original powder container when the reloading is completed for the day prevents discoloration of the hopper.