From my experience BM 3 is a fine propellant! Everyone I've spoken to who's tried it agrees.
If you'd like to get some more or try it for the first time, visit the link below, BUT...

Sit down first http://www.go2gbo.com/forums/Smileys/default/tongue.gif

http://www.mdm-muzzleloaders.com/Merchant2/merchant.mvc?Screen=CTGY&Store_Code=M&Category_Code=POWDER