When I was necking sizing some brass the powder reservoir on the RCBS Powder Measure just fell off. I lost about 1/2 pound of powder, and the cleanup took awhile. Per RCBS website "The measuring cylinder has precision ground surfaces and slides into the honed main casting for a precision fit." If you own a RCBS Uniflow Powder Measure or Quick Change Powder Measure make sure that it's seated all the way down.
You have been warned.
You have been warned.