I think that 130 and 131 covers the amount of ammo you can possess and how you can store it, 136/137 covers storage containers for powder, 140(1)(a) says you can have 10kg of gunpowder and I think that 13(8) says primers are classified as ammunition (and I assume that means you follow the same storage rules for primers as ammunition.
Does that seem to be correct? If it is maybe a Mod could sticky it...
Explosives Regulations (C.R.C., c. 599)
130. In regard to any container, the following provisions shall be observed:
(a) it shall be provided with a closely-fitting lid and shall be kept securely closed and locked except when the container is required to be open for the receipt or issue of explosives, or for other necessary purpose;
(b) it shall not be used for any other purpose than the keeping of manufactured fireworks of Division 2 of Class 7, or of explosive of Division 1 of Class 6 (ammunition);
(c) the interior of the container shall be kept scrupulously clean; and
(d) the container shall have the word “AMMUNITION” or “FIREWORKS”, as the case may be, conspicuously displayed thereon on a contrasting background.
131. Subject to any provincial law or regulation or any municipal by-law, a person may, if he takes reasonable precautions against accidents, keep in his possession on his premises, for private use and not for sale,
(a) a quantity of Division 2 of Class 7 fireworks, not exceeding 10 kilograms gross weight, that were sold to him in accordance with these Regulations;
(b) such quantity of safety cartridges as he may reasonably require for a rifle, revolver or shotgun that he may lawfully possess and use; and
(c) any quantity of Christmas crackers and caps for toy guns.
136. In this Part, “suitable receptacle” means a substantial box or substantial container,
(a) that may be placed inside a building that is not itself adapted for the keeping of explosives;
(b) the location of which is not changed from that prescribed by an inspector or under provincial or municipal law;
(c) that is kept away from goods of an inflammable nature; and
(d) that is of easy access for removal in case of fire.
137. In regard to any receptacle, the following provisions shall be observed:
(a) it shall be provided with a closely fitting lid secured by a lock, and hinges and fastenings, preferably of copper or brass, and otherwise closed and secured so as to prevent unauthorized persons having access thereto, and shall be kept locked except when required to be open for receipt or removal of explosives, or other necessary purpose;
(b) it shall be exclusively used for the keeping of explosives;
(c) it shall be made of wood, copper or other suitable material;
(d) the interior of the receptacle and all fittings therein shall be so constructed, covered or lined as to prevent the exposure of any iron or steel, or of any hard or gritty surface, or the entry, detaching, or accumulating of grit, iron, steel or similar substance;
(e) the interior of the receptacle shall be kept scrupulously clean; and
(f) the receptacle shall have the word “EXPLOSIVES” conspicuously displayed thereon on a contrasting background.
13. (8) Division 3 comprises any ammunition that contains its own means of ignition, and is not included in Division 1, such as detonators, percussion caps not included in Division 1, friction tubes, percussion primers, fuses for shell (such as time and percussion fuses) if such fuses do contain their own means of ignition.