Overall, I agree with you HQ, it should be possible given certain assumptions.
The reason I used the 5.56 example was to give a base that can be duplicated from the current rule set. I didn't want to completely improvise the numbers and tried to think of a some what logical way to make the math work.
But also, dont forget those production numbers do include making your own gunpowder, your own primers and bullets. Not simply the process of pumping out a finished round.
Two side questions I have here though:
1) Do the cases have to be brass? Wouldnt steel cases be more durable?
2) Same question with the bullet, why not steel?
Reason I ask is I see lead being alot harder to find then steel in a urban environment. There can only be so many batteries or old fashioned lead pipes around. And with most of the states lead mines being in the middle of the country, getting them to NYC would be more then a challenge.
