Official forum enigma
Roger that, Chargar. A small thing, but chemical weirdnesses are off-putting. Too many drug labs in my past life, I guess. I have never seen Unique or 2400 cause that in my tools.
In 53 years of reloading, I have never left any powder in the measure overnight. I was told early on not to do that. Not to prevent damage to the masure, but as a safety measure, not to forget which powder it was and what can it went in.The new made Alliant Bullseye is listed at 30-40% nitroglycerin in its composition, and Unique at 20-30% and 2400 at 5-10%. It is the nitroglycerin that dissolves the plastics in powder measures, at a rate dependent upon temperature and humidity. Double based rifle powders tend to have such heavy deterrent coatings, that the powder doesn't etch the plastic. Never a good idea to store powders in anything but the original containers.