Any of these folks should be able to help you.

Reamer Makers

Clymer - http://www.clymertool.com/welcome.html
Pacific Tool - http://www.pacifictoolandgauge.com
JGS Tools - http://jgstools.com
Dave Manson Precision Tools - http://www.mansonreamers.com
Triebel Waffenwerkzeug - http://triebelguntools.de

I have some Bertram brass if you need it and can wait until May when i get home