(a)Except in the case of subsection (l), (m), (n), or (o) of section 842 and subsections (d), (e), (f), (g), (h), and (i) of section 844 of this title, this chapter shall not apply to:

(1)aspects of the transportation of explosive materials via railroad, water, highway, or air that pertain to safety, including security, and are regulated by the Department of Transportation or the Department of Homeland Security;
(2)the use of explosive materials in medicines and medicinal agents in the forms prescribed by the official United States Pharmacopeia, or the National Formulary;
(3)the transportation, shipment, receipt, or importation of explosive materials for delivery to any agency of the United States or to any State or political subdivision thereof;
(4)small arms ammunition and components thereof;

(5)commercially manufactured black powder in quantities not to exceed fifty pounds, percussion caps, safety and pyrotechnic fuses, quills, quick and slow matches, and friction primers, intended to be used solely for sporting, recreational, or cultural purposes in antique firearms as defined in section 921(a)(16) of title 18 of the United States Code, or in antique devices as exempted from the term “destructive device” in section 921(a)(4) of title 18 of the United States Code;

(6)the manufacture under the regulation of the military department of the United States of explosive materials for, or their distribution to or storage or possession by the military or naval services or other agencies of the United States; or to arsenals, navy yards, depots, or other establishments owned by, or operated by or on behalf of, the United States?[url=https://www.law.cornell.edu/uscode/text/18/845#fn002064][1][/url] and
(7)the transportation, shipment, receipt, or importation of display fireworks materials for delivery to a federally recognized Indian tribe or tribal agency.
(b)(1)A person who is prohibited from shipping, transporting, receiving, or possessing any explosive under section 842(i) may apply to the Attorney General for relief from such prohibition.

(2)The Attorney General may grant the relief requested under paragraph (1) if the Attorney General determines that the circumstances regarding the applicability of section 842(i), and the applicant’s record and reputation, are such that the applicant will not be likely to act in a manner dangerous to public safety and that the gr

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Washington state law says you can't store more than 5 lbs of black powder in a residence. And no more than 25 lbs of smokeless powder in a residence unless it's in a plywood cabinet (magazine), which allows up to 50 lbs (RCW 70.74.340). Only 10k primers, too (RCW 70.74.350).

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That's just.....