Hi
This might help some, don't know if links are allowed but,
http://airbornecombatengineer.typepad.com/airborne_combat_engineer/2005/01/pushing_the_500.htmlhas info on ranger ricks 700 grainers and a link to mountain molds.
if not try
http://www.mountainmolds.com/or
Mountain Molds
Cast Bullet Molds
85 Old Homestead Road Cottonwood, Idaho 83522
I believe you can design your own dies with their software. and from what I've read they're pretty helpful.
Ranger Rick also sells the Keith bullets in 535 gr gas checked
16.75 per 50 + s&h
http://www.lsstuff.com/ranger-rick/I believe he bought his molds from mountain molds. And no I'm not rick just a satisfied customer.