Here is what you are looking for I believe. The only place I can see that states that smokeless powder (Class 1.1D) can not be stored in a dwelling is in section 23-3 but that relates to a Class 1 substance held under lock and key.
When you look further down to Table 7 it states that less then 15 kgs of Class 1.1D does not need to be under lock and key.
Hopefully someone else can point us in the direction of where it says we aren't allowed to store less than 15kgs of smokeless powder in our dwellings.
One other thing I found interesting is that in clause 13A it says no one is allowed to display Class 1 substances for sale other than Fireworks. Guncity may need to take note!
Hazardous Substances (Classes 1 to 5 Controls) Amendment Regulations 2003 (SR 2003/177) (as at 01 December 2017) – New Zealand Legislation
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