Big Bear, a fair and honest response!
If I could elaborate just a bit, buying what you need (of anything) for a short period of time always implies an endless, readily available supply of replacements and an anchored-in-stone supply chain. Sort of the personal extension of manufacturing's concept of Just-In-Time...components arrive at the ammo factory just in time to be assembled, are shipped to the store just in time to replenish items sold and into your hands just in time for you to head out to the range. The Internet and amazing advances in transportation over the last 25 years have stretched the supply chains to global...the shrimp you bought for dinner last night were being harvested in Vietnam a few days ago, for example...unthinkable just a few years ago.
However, the advances have effectively hidden the fragility of the overall system. Pandemic flu in Mexico, for example, has huge implications for American factories waiting for just in time deliveries of Mexican parts. Anything that slows border crossings would have a similar effect, which is why our borders remain open when just a couple of decades ago, they would have been reflexively closed or drastically tightened up in the face of an outbreak. Better the flu than industry grinding to a halt in the middle of a recession...the law of unintended consequences always applies.
That global supply chain is under attack by our foreign enemies; easier and far more effective to cripple shipping in critical transit areas than blow up another building in urban America.
Ammo itself is under attack by our domestic enemies, which have failed to enact the legislation they hoped for against firearms.
Buying what you need just before you consume it implies a faith in the overall system that I do not share. Stuff happens, and because of the global supply chain it can happen in Sri Lanka and in 48 hours have an effect on my living room. Also remember that stocking up on anything is in effect speculating in a commodities market, the same thing some guys get paid vast sums of money to do around the world and that is at the heart of a free trade system. Instead of "going long" on pork bellies, I'm going long on .22 LR. That is, I'm committing today's dollars at a fixed price on a commodity on the bet that the price of that commodity will rise in the future. Whether I have secured that commodity at that price for my personal consumption or for speculation is irrelevant.
And, frankly, everyone speculates...didn't we buy our houses — for most of us the most expensive purchase of our lives — on the assumption that they would rise in value and thus provide us with a benefit? I don't know of anyone who walked away from a great deal on a house because they were afraid their neighbors couldn't get the same deal. We do the same thing in the supermarket...when a product is undervalued — called a "sale" — we buy more of the product, speculating that the price of the product will soon return to baseline, or go up.
Back in the 1960s when I was in college my buddy Mack and I figured that one should always have "sufficient" ammunition for one's "basic" guns (okay, we swiped that from Col. Cooper, whom we read religiously). At the time it mean spending what was then a fortune for 250 rounds of .38 S&W for my one centerfire and 2 or 3 bricks of .22. When I started competing, I decided that I needed a 1000-round "float" — about a week's worth of practice and match ammo, all reloads — on my primary competition calibers, and I made sure my carry guns were in the same caliber. I then bought 250 rounds of personal defense ammo, which I used sparingly.
I am presently operating on a replacement basis...I just spent $400 replacing what I used up last week, mostly in filming episodes of the shows. Objectively, I have a lot of ammo stockpiled, but yesterday I did some "rough cut" evaluations based on filming the shows, shooting competitions and training, and I didn't like what the numbers told me. The ultimate purpose of a stockpile is to buffer against either shortages or price increases and allow you to keep doing "X" at the same rate you were doing X before. I'm having to suck it up and replace what I use at whatever price I can cover because I'm looking at next year's show!
Michael B