Well time to be a bit aggressive you don't want to leave a wet patch in the bore for too long. Just for giggles I would remove the ventliner and stick the breech in a bucket of warm soapy water and start cleaning the bore with a jag and patch and see if that makes the patch move into a position that makes it easier to snag with the worm. The pumping of water in and out of the bore should get it loose.

You are actually lucky last time I lost a patch in the bore it had a broken jag attatched to it.[:-]