http://gandersmuzzleloadingblog.blogspot.com/2011/01/cva-muzzle-loaders-keepem-clean.html

sorry guys, i was out hunting for 9 days.

CCI 209 Magnum primers
#32 or 3mm drill bit - clean flash channel every 6 shots or so.

The most important deal however is making sure you adjust the head space for a TIGHT primer fit so the primer seals up all the gasses rather than dumping it in the frame.