Very much an issue; especially for handloader's who use
the slower burning powder's, such as 2400 and H-110.
The problem arise's when unburned powder accumulate's
underneath the star. If it is not cleaned out, it can build
up enough to stop a revolver from functioning properly.
I always carry an old toothbrush in my range bag, just
for cleaning the dirt and debris away from the star.
Best Wishes,
Ala Dan, N.R.A. Life Member