At a 10,000-foot level, Felix I agree with your comments. Especially, the procurement of a suppressor for a long gun (s).
Now down in the weeds, I recommend having more than 700-rounds of 5.56 on hand.
I have a set minimum number of ammunition on hand. When I practice, which I do often, I replace the ammo used up to the aforementioned minimum. Since ammo has gone through the roof, I have used about 1,000-rounds of 5.56 so, I am looking to replace what I have used. Similarly in 9mm.
Due to a high draft number (Remember those days
) I never served in the military so what I have to write is pretty much worthless. With that written, I will dive into the shallow end of the pool.
Doing active training drills it is pretty easy to blow through 4-mags (120-rounds) of ammo in 2 to 3-minutes. I tend to carry 7-mags with one in my rifle so 8-mags, 240-rounds.
I am of the age that I will not be a ground pounder but part of the auxiliary. That does not preclude me from a kinetic exchange on occasion doing different tasks around the redoubt, e.g. occasional patrols, traveling between neighbors redoubts, etcetera.
Now getting back to the premise of your post Felix, why put all of your eggs in one basket. I wholeheartedly agree Sir. Like everything in life, everything in moderation. Instead of adding another 1,000-rounds to your stockpile maybe spend the same money on a set of Peltor Comtac 3 noise canceling/comms ear muffs. As already mentioned and if legal in your state, invest the money in a suppressor. Just in my opinion, the best money to spend on the bullets part of the BBB is a set of NVG's and for kicks and giggle a IR laser. These tools are game changers almost as good as having 8-mags of ammo on you when you go out on a trek.
Great thought provoking comments Felix. Thanks for posting.