Stealthy, TaylorWSO, bdawg, Eric802, JoeGunner... thanks for your input. Particularly you guys with a lot of experience, I didn't want to turn this into an ammo bash, just wanted the facts on what I can do myself to reduce the risk of failures. Turns out, there isn't a whole lot.
If anyone else has any input or anything they do to check their ammo before shooting it would be much appreciated. I think even with ammo that has a good reputation; I will still be inspecting each individual round before I put it in my magazine.
I did the math:
150 rounds @ $0.39/round ... I saved $16 over buying the standard $10/box M193 5.56 that I have been finding (although I am not including shipping on the online orders for that ammo.). Either way, even if it came out to $20 savings that seems trivial with the risk of blowing up my gun or worst case scenario having an incident while my girlfriend is shooting. I couldn't forgive myself for that.
Again, thanks for the input.