[Fiberwyre_P2P]

I think you're completely ignoring the long laborious process of turning raw minerals into metals that can actually be used to make ammo.
And lets not forget the fact that nowhere in the process is gunpowder introduced, which is pretty fundamentally important in the bulletmaking process.
Also lets not ignore the fact that the bullets come in boxes, which are never manufactured and just magically appear when you've grabbed the table enough times.
Also, unless we're making the bullet casings out of lead (which would be dumb, to say the least), we are missing the brass with which to do so.

That's not even taking into account Pyrotech who are apparently alchemists who can make explosives exclusively out of iron and lead.

Food might not be as easy to make as grabbing a table, but neither is ammo.