IANAL, but individual states, counties, etc can have varying laws prohibiting simple possession of explosives. I am not sure how a a prohibited item being used only as a precursor to a non-prohibited item works legally, do your own research and make your own decisions.
I notice in your acid mixture you do not call out if your percentages are by weight or volume.
I would also separate out the synthesis of nitroglycerin and probably call out quite a few more safety considerations. How much can/should be made in one batch? How do you keep it from thermal runaway? What to do for thermal runaway? PPE?
Do you have loading/velocity/particle size data to show why you arrived at 0.162g? Grain surface area is a huge factor in burn rate and should be controlled in some manner.
I’ve always been curious why microcrystalline cellulose (your average hard supplement pill binder) hasn’t been used.
Not trying to be overly critical, this is very important, but also very dangerous to encourage others to do without a very thorough exposition.