The Amount of Gun powder you can store up to before you have to seek a special storage license form WorkSafe or some other Simular State Body
State / Terrory Amount Notes:
ACT 2 Kilos
NSW 10 Kilos but you have to have a storage distance of 10 meters between gun powder and percussion caps
NT 10 Kilos
S.Aust. 3 Kilos
Tas 5 Kilos
Vic 5 Kilos but you have to have a storage distance of 10 meters from a source of ignition but it does not apply to an ignition source needed to fire an explosive charge.
W. Aust. 4 Kilos but no more than 2 Kilos may be stored in any one container.
Courtesy of Jenny Baker at: https://sites.google.com/site/historicalreenactments/Resources/gun-powder-allowances-for-each-state