Check out the components page at "The Hawken Shop" for a very useful looking flinters tool. The tool includes a device to clear out the breech hole near the flash pan.
http://www.thehawkenshop.com/misccomponent.asp
A write-up on the tool is on this page:
http://www.thehawkenshop.com/catalog5.htm
I would think it would be an indispensable addition to a flinters possibles bag.