It was also, if memory serves me correctly, the biggest reason for unreliability in the M16 in Vietnam. The original propellant was stick. Then they switched to ball and it had something, too much calcium or something which caused fouling.
They changed formulations, chromed the chamber and gave out comicbooks on how to clean properly. And they got pretty good service after.
This going by a long time ago memory. So some might be wrong.