Short answer: no.
Long answer: We don't need any more gov't control of the firearms industry than we already have. In fact, imo, we need far less than we have right now. A law requiring ammo companies to know about antiques would drive up the price of ammo, since they'd be expected (even if not required) to stock ammo for said antique, among other reasons.
A tip for you on the antique ammo: take the gun to a well-respected collector or antique gunsmith. He can tell you what it fires and if it's even in a condition to be fired. My dad has an old .32 Rimfire revolver from the Spanish-American War that we did this with. We found out the caliber, and that it was in good enough condition to fire. A word of warning though: the ammo ain't cheap. 50 rounds cost $50 at a local gunshow. Nearly twice that online.