Reply #15: Here's the relevant section of code- [View All]

[X_Digger]

http://law.onecle.com/uscode/15/2602.html

As used in this chapter:
<snip>
(2)(A) Except as provided in subparagraph (B), the term "chemical
substance" means any organic or inorganic substance of a particular
molecular identity...<snip>
(B) Such term does not include -
<snip>
(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.

ie, ammunition is explicitly excluded from the EPA's ability to regulate via 15 USC Section 2602