Got one stuck! Pulled nipple clean out screw, bolster not removable, felled with Swiss null B untill it would hold no more.After experience and reading from knowledgeable folks here, I got rid of my brushes. I use a wet (not damp) patches when needed. Run a dry patch or two and have never had damp powder issues. If you use brushes enough, eventually you'll be on the forum asking about how to extract a stuck one.
I do not know how much it held but was very little used a pan primer, replaced screw caped the nipple and shot it out. Very quick and easy peasy.
could have also tried the co2 tool it works very well for dry ball.
Blitz