Go here, spend the money, get what you want made the way you want it.

http://www.brownells.com/.aspx/pid=1849/Product/30-06-Length-Action

or here, these are the same as Interarms.

http://www.zastava-arms.rs/cms/index.php?id=238

Check here to find a USA source: VULCAN ARMS, Inc, 9487 Inver Grove, MN 55076 (651) 451-5956

If you want to build on something more modern then look at:

http://www.brownells.com/.aspx/pid=32498/Product/Small-700-SA-Receiver-Blued

Scroll down, they have magnum SS long and CMS short magnum receivers.

have fun