I decided to try some bargain basement ammo. Specifically this:
http://www.cheaperthandirt.com/AMM2911-1.html

It's TulAmmo .223 hollow point 65 grain. It's steel cased, and Russian made. I wasn't expecting alot, but I've already shot 180 rounds, and I haven't had a single failure to fire, or failure to eject. I'm impressed.

My one question is on accuracy as the grouping appears to be relatively poor (could just be me and a new rifle shooting offhand), so I'm going to buy some other ammo the next time around and see how it goes. If I'm getting similar grouping, going to keep purchasing this stuff.

I am shooting this out of my Smith and Wesson M&P 15 Sport that I picked up two weeks ago.