Any large flake powder and TB's little washers will have a fancy for bridging;a couple of light knocks on the steel part of Little Dandy with a small metal thing(I use a 7/16 small wrench)should break the bridge while holding the case up to the spout.
As a failsafe,check the level of powder anyway TB being such a quick burner.(I know it is so bulky but one is never too careful).