Check out
www.wisconsincartridge.com for .223. They are reloads, but a case of FMJs for $300 is hard to beat in this day and age. Sadly. Never had a problem with their reloads, and I am pretty picky about what I put through the Bushmaster.
I'll check out that case of PMC though. $449 isn't too bad. Although I'd proly go 5.56 for those prices.