The 10,000 primer limit is probably not a law but here's where I read it.
Primer Storage
Due to their explosive nature only an absolute minimum should be kept in storage. The National Fire Protection Association' NFPA 495 says that not more than 10,000 primers should be stored in a private residence. This recommendation is law in most communities. Even a deeply involved reloader should have no reason to store more than 1,000 of each of large rifle, large rifle magnum, small rifle, large pistol, large pistol magnum, small pistol, small pistol magnum, and shotshell primers. That's 8,000 primers. With care in replacing exhausted supplies, it is not difficult to adhere to the 10,000 primer limit. Many, if not most reloaders will be able to get along nicely with far fewer primers kept on hand.
Always store primers in a remote area away from any possible source of ignition including bullet impact. Be sure no heat, spark, electrical percussion, or any other form of abuse can occur in the storage area.
Keep primers stored away from oxidizing agents, flammable liquids, and flammable solids (including handloading powders).
A storage cabinet is strongly recommended. A cabinet should be solidly constructed of 1" thick lumber to delay the transfer of heat to the contents in the event of a fire. or other mishap. Make sure the storage cabinet is remotely located with respect to trash, combustible materials, sources of heat (including sun rays), open flames, electrical equipment, hot water heaters. mechanical equipment, furnaces. solvents, flammable gasses, and so on. To avoid the potential of an unexpected or unusual accident, do not store anything else in the primer cabinet.
Naturally never smoke around primers. No smoking signs in the storage area and at the loading bench are suggested.
A bulletin is available from SAAMI entitled "Sporting Ammunition Primers: Properties, Handling, and Storage For Handloading". Every reloader should acquire a copy from:
Due to their explosive nature only an absolute minimum should be kept in storage. The National Fire Protection Association' NFPA 495 says that not more than 10,000 primers should be stored in a private residence. This recommendation is law in most communities. Even a deeply involved reloader should have no reason to store more than 1,000 of each of large rifle, large rifle magnum, small rifle, large pistol, large pistol magnum, small pistol, small pistol magnum, and shotshell primers. That's 8,000 primers. With care in replacing exhausted supplies, it is not difficult to adhere to the 10,000 primer limit. Many, if not most reloaders will be able to get along nicely with far fewer primers kept on hand.
Always store primers in a remote area away from any possible source of ignition including bullet impact. Be sure no heat, spark, electrical percussion, or any other form of abuse can occur in the storage area.
Keep primers stored away from oxidizing agents, flammable liquids, and flammable solids (including handloading powders).
A storage cabinet is strongly recommended. A cabinet should be solidly constructed of 1" thick lumber to delay the transfer of heat to the contents in the event of a fire. or other mishap. Make sure the storage cabinet is remotely located with respect to trash, combustible materials, sources of heat (including sun rays), open flames, electrical equipment, hot water heaters. mechanical equipment, furnaces. solvents, flammable gasses, and so on. To avoid the potential of an unexpected or unusual accident, do not store anything else in the primer cabinet.
Naturally never smoke around primers. No smoking signs in the storage area and at the loading bench are suggested.
A bulletin is available from SAAMI entitled "Sporting Ammunition Primers: Properties, Handling, and Storage For Handloading". Every reloader should acquire a copy from:

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