10-3.7 Smokeless propellants intended for personal use in quantities not exceeding 20 lb (9.1 kg) may be stored in original containers in residences. Quantities exceeding 20 lb (9.1 kg), but not exceeding 50 lb (22.7 kg), may be stored in residences if kept in a wooden box or cabinet having walls or at least 1-inc. (25.4-mm) nominal thickness.
50 lbs is easy to get to. Got remote storage?
I do have alternate climate controlled storage on site. I was wondering about that and now I know! I usually have one powder on the bench, so I’ll split it up and store it.