No provision of section 29-343, 29-345, 29-348, 29-349 or 29-355 shall apply to small arms ammunition or components thereof, or to gun powder in quantities of not more than fifty pounds in any one place, or to any materials for hand loading, reloading or custom loading small arms ammunition for hunting or other sporting purposes; and any person, firm or corporation, which has obtained and is the holder of either (1) a valid license as an importer, manufacturer, or dealer, or (2) a valid user permit, under the provisions of the federal organized Crime Control Act of 1970, Public Law 91-452, or any law amendatory thereof, shall be entitled to the issuance of a permit and license under said sections; provided blasters, detonators or users of high explosives shall obtain a license of technical qualification under subsection (b) of section 29-349.