After the crisis, and throughout, was there ever an extreme shortage of ammo? I know there was in the States for a while while Obama was being elected, and that was mostly panic buying. I carry a .45acp, a very common round in the states, and I'm sure Argentina. You talk about 1911s quite often. Was there ever a time where you couldn't find .45acp around and had to use 9mm? 9mm is more common than .45 worldwide and it would be my choice if I was in Europe, Asia, the middle East, and Africa. But in the States, I don't want to someday find that I can't feed my XD45 because the only thing around is 9mm.
Panic buying eventually ends and frankly, dealers are happy of doing good business, more ammo is made, so its at worst a very short term problem.
Someone once said, President Obama should be named "Gun Dealer of the Year", because thanks to him thousands of guns and tons of ammo have been sold. There's a lot of truth to that.
What happened here was that people were buying more guns and ammo out of fear but at the same time, prices where going up a lot, odd calibers stopped being imported so they were hard to find ( like my 357 SIG)
Ammo was still available, even if in much less amounts and much higher prices.
Odd ball calibers where much harder to get by and prices were ridiculously expensive.
Because of this I recommend sticking to common calibers at first (you can always come by a box of 9mm rounds)and then having other calibers too in case your particular choice can't be found.
This also meant that quality reloaded ammo was in high demand. I've used reloaded Argentine brands like Waffen and Stopping Power, they sure are better than no ammo at all, and I've come to appreciate their overall good quality. (Stopping power ammo is better if you can find it, Waffen sometimes comes with crushed reloaded cases)
Start with common caliber weapons ( start with 9mm) then get others in 40 and 45. And most of all, DO have ammo for your gun! The rainy day stash is mandatory for anyone 1/2 serious about armed self defense.