My understanding is that this attempt to ban all traditional ammunition is under the Toxic Substance Control Act of 1976... a law in which Congress expressly exempted ammunition. In other words, the EPA lacks the authority to enact a ban and any attempt will be quickly struck-down in court.
From another site:
ammunition is explicitly excluded from the EPA’s ability to regulate via 15 USC Section 2602
http://law.onecle.com/uscode/15/2602.html
As used in this chapter:
(2)(A) Except as provided in subparagraph (B), the term “chemical substance” means any organic or inorganic substance of a particular molecular identity...
(B) Such term does not include -
(v) any article the sale of which is subject to the tax imposed by section 4181 of the Internal Revenue Code of 1986 {26 U.S.C. 4181} (determined without regard to any exemptions from such tax provided by section 4182 or 4221 or any other provision of such Code)
And 26 U.S.C. 4181 refers to: http://codes.lp.findlaw.com/uscode/26/D/32/D/III/4181
There is hereby imposed upon the sale by the manufacturer,
producer, or importer of the following articles a tax equivalent to the specified percent of the price for which so sold:
Articles taxable at 10 percent -
Pistols.
Revolvers.
Articles taxable at 11 percent -
Firearms (other than pistols and revolvers).
Shells, and cartridges.
Which court?