To be fair, I thought you mean "bullet for bullet" when you said, "1 to 1 trade, my 9mm for your 5.56". I imagine he did too.
I wasn't going to crap on your thread because I assumed everyone would be chuckling at the idea of bullet for bullet trading and would just ignore the thread. But it now sounds like what you're saying is, "1 box of 9mm (50 rounds) for 1 box of .556 (20 rounds)", which would actually be 2.5 to 1. Correct?