Yup! That was at least part of it.
I took the thing apart and cleaned it. Hadn't done that in a while.
Reassembled it.
Got rid of about 1/4 pound of Varget that seemed to be "clumping" a bit.
Then I grabbed a fresh dryer sheet and used it on the plastic drop tube...
All was well after that. I loaded another 50 rounds of 308 Win last night, and the powder measure worked perfectly... So... A little PM now and again is a mighty fine idea.
Regards, Guy