Here are a couple of sources for brass:

http://www.grafs.com/bulkByVendor.cfm/startItem/26

http://www.sinclairintl.com/

http://www.midwayusa.com/rewriteabrowse/2/7446/9315+***+652+***+670+***+9013+***
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As far as making a false shoulder, you have to go up to .400 then neck it down to do any good. I would recommend going to Z-Hat cylinder brass and necking down then trimming to length.

http://www.z-hat.com/Cylinder.htm

Best.


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