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Midway also has their own line of 223 bullets. I have a couple boxes but haven't tried them yet:

http://www.midwayusa.com/viewproduct/?p ... =939269531" onclick="window.open(this.href);return false;
http://www.midwayusa.com/viewproduct/?p ... =939655304" onclick="window.open(this.href);return false;

They're currently out of stock, but Midway lists Hornady bullets in boxes of 1000:

http://www.midwayusa.com/viewProduct/?p ... 1165165907" onclick="window.open(this.href);return false;

My current bullet supply is Montana Gold.

I have ordered once-fired brass from Wilson combat:

http://shopwilsoncombat.com/Brass/products/277/" onclick="window.open(this.href);return false;