Get a hammer and hit right between where the studs are on the brake drum.  
You can hit here with alot of force and not hurt anything.  This should break
the drum loose and then it should just come off by pulling it with your
hands.  The puller is only for pulling the hub assembly off.  Hope this helps.

Thanks,
Ken Wilford
John 3:16
www.vanagain.com
Phone: (856)-765-1583
Fax: (856)-327-2242