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Got his from SAAMI:
11-3.7 Smokeless propellants intended for personal use in quantities
not exceeding 20 lb. (9.1 kg) shall be permitted to be stored in original
containers in residences. Quantities exceeding 20 lb. (9.1 kg), but not
exceeding 50 lb. (22.7 kg), shall be permitted to be stored in residences
where kept in a wooden box or cabinet having walls of at least
1 in. (25.4 mm) nominal thickness.
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