I used a non-working stainless side by side fridge I got off craigslist, heli-arced a lock on it and put a few extra shelves in with a dehumidifier rod. Works awesome.

DO NOT SUBJECT THE STORAGE CABINETS TO CLOSE CONFINEMENT. STORAGE CABINETS SHOULD BE CONSTRUCTED OF INSULATING MATERIALS AND WITH A WEAK WALL SEAMS OR JOINTS TO PROVIDE AN EASY MEANS OF SELF-VENTING.
http://www.alliantpowder.com/getting_started/safety/storage_handling.aspx

http://www.thehighroad.org/archive/index.php/t-337012.html
From Hodgdon's Website:
http://www.hodgdon.com/data/general/nfpa.php

National Fire Protection Association (NFPA) Guidelines
Note: Pyrodex® and Triple Seven® muzzleloading powders are not smokeless powders, but the same principles and regulations for storage apply.

13-3 SMOKELESS PROPELLANTS

13-3.1 Quantities of smokeless propellants not exceeding 25 lb (11.3 kg), in shipping containers approved by the U.S. Department of Transportation, shall be permitted to be transported in a private vehicle.

13-3.2 Quantities of smokeless propellants exceeding 25 lb (11.3 kg) but not exceeding 50 lb (22.7 kg), transported in a private vehicle, shall be transported in a portable magazine having wood walls of at least 1 in. (25.4 mm) nominal thickness.

13-3.3 Transportation of more than 50 lb (22.7 kg) of smokeless propellants in a private vehicle shall be prohibited.

13-3.4 Commercial shipments of smokeless powder for small arms which has been classed in Division 1.3 shall be permitted to be reclassed as Division 4.1 Flammable Solid for transportation purposes for shipment by motor vehicle, rail car, vessel, or cargo-only aircraft, subject to the conditions stated in the U.S. Department of Transportation "Hazardous Materials Regulations," 49 CFR 173.171.

13-3.5 Commercial shipments of smokeless propellants exceeding 100 lb (45.4 kg) or not packaged in accordance with the regulations cited in 13-3.4 shall be transported in accordance with the U.S. Department of Transportation regulations for Class B propellant explosives.

13-3.6 Smokeless propellants shall be stored in shipping containers specified by U.S. Department of Transportation Hazardous Materials Regulations.

13-3.7 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.

13-3.8 Not more than 50 lb (22.7 kg) of smokeless propellants, in containers of 1 lb (0.45 kg) maximum capacity, shall be displayed in commercial establishments.

13-3.9 Commercial stocks of smokeless propellants shall be stored as follows:

(1) Quantities exceeding 50 lb (22.7 kg), but not exceeding 100 lb (45.4 kg), shall be stored in portable wooden boxes having walls of at least 1 in. (25.4 mm) thickness.

(2) Quantities exceeding 100 lb (45.4 kg), but not exceeding 800 lb (363 kg), shall be stored in nonportable storage cabinets having walls of at least 1 in (25.4 mm) thickness. Not more than 400 lb (181 kg) shall be permitted to be stored in any one cabinet, and cabinets shall be separated by a distance of at least 25 ft (7.63 m) or by a fire partition having a fire resistance of at least 1 hour.

(3) Quantities exceeding 800 lb (363 kg), but not exceeding 5,000 lb (2268 kg), shall be permitted to be stored in a building, provided the following requirements are met:

(a). The warehouse or storage room shall not be accessible to unauthorized personnel.

(b). Smokeless propellant shall be stored in nonportable storage cabinets having wood walls at least 1 in. (25.4 mm) thickness and having shelves with no more than 3 ft. (0.92 m) of separation between shelves.

(c). No more than 400 lb. (181 kg) shall be stored in any one cabinet..

(d). Cabinets shall be located against the walls of the storage room or warehouse with at least 40 ft (12.2 m) between cabinets.

(e). The separation between cabinets shall be permitted to be reduced to 20 ft (6.1 m) where barricades twice the height of the cabinets are attached to the wall, midway between each cabinet. The barricades shall extend at least 10 ft. (3 m) outward, shall be firmly attached to the wall, and shall be constructed of 1/4 in. (6.4 mm) boiler plate, 2 in. (51 mm) thick wood, brick, or concrete block.

(f). Smokeless propellant shall be separated from materials classified by the U.S. Department of Transportation as flammable liquids, flammable solids, and oxidizing materials by a distance of 25 ft. (7.63 m) or by a fire partition having a fire resistance of at least 1 hour.

(g). The building shall be protected by an automatic sprinkler system installed in accordance with NFPA 13, Standard for the Installation of Sprinkler Systems.

(4) Smokeless propellants not stored in accordance with 13.3.9 (1), (2), and (3) shall be stored in a Type 4 magazine constructed and located in accordance with Chapter 8.

Reprinted from NFPA495-85, Standard for the Manufacture, Transportation, Storage and Use of Explosive Materials, © 2001, National Fire Protection Association, Quincy, MA 02269. This reprinted material is not the complete and official position of the NFPA on the referenced subject, which is represented by the Standard in its entirety.

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W.E.G.