(2) Storage By Permit: In accordance with the provisions of M.G.L. c. 148 § 13, the Board hereby prescribes the following quantities of explosive materials that shall be exempt from License, and Registration, and may be kept, or stored in a building or other structure provided a permit has been obtained from the head of the local fire department;
(a) Small Arms Ammunition: Private Use. Small arms ammunition in amounts over that specified in 527 CMR 13.04(1), that do not exceed 100,000 total rounds at any one time, may be kept for private use provided none of the individual limitations listed below are exceeded.
1. 10,001 to 30,000 rounds of rim fire ammunition.
2. 10,001 to 50,000 rounds of center fire ammunition not to include shotgun ammuni-tion.
3. 10,001 to 50,000 rounds of shotgun ammunition not to include center fire ammunition.
(b) Small Arms Ammunition: Commercial Use. Not to exceed 200,000 rounds in any combination.
(c) Small Arms Ammunition Primers: Private Use
Not to exceed 10,000 Small Arms Ammunition Primers.
(d) Small Arms Ammunition Primers: Commercial Use
Not to exceed 100,000 Small Arms Ammunition Primers.
(e) Smokeless Propellants: Private Use
1. Not to exceed 48 pounds Smokeless Propellants.
2. Persons under 18 years of age may not keep or store Smokeless Propellants.
3. The head of the local fire department may limit the quantity of smokeless propellants stored by permit to as low as two pounds if such propellant shall be stored in a multiple family dwelling or a building of public access.
However there is some restriction on max primers per residence. Went thru this with my FD a while ago. Here are the words:
"Although the code permits up to 10,000 primers for private use, no more than 5000 may be stored in a residence, which includes the dwelling unit and all accessory buildings (the shed). So only 5000 primers may be stored at your home, still preferably in the secured shed and not the dwelling unit. If you want to exceed the limits set forth in the regulation then you must apply for a license from the Town. This process is involved, to include advertising in the local newspapers, sending certified letters to all you abutters notifying them of your intent and going before the Board of Selectman. Other permits from federal agencies, such as ATF, may also be required"