So here's that thread, @Alex!After the pandemic ammo drought I decided it would be useful to have guns in several different calibers. At one point the only handgun ammo on the shelf at my LGS was 10mm auto. That is what sparked my interest in this cartridge. As a bonus this model covers 2 different cartridges, 10 & 40. Once upon a time all the smart people said to have a 9mm handgun because that would always be available. During the summer of 2020 the only thing available locally was 10mm and 350 Legend. Who knows what it will be next time. But that is a topic for a different thread.
There are those who suggest consolidating ammo / calibers to make things simpler. Make all your guns 9-mm for example. 9-mm pistols and 9-mm carbine rifle. I guess that will work if you have a LOT of that particular ammo in your inventory. But what if you're on the move? You can't carry your entire inventory. What if you run out of ammo on the move? Will you be able to find that caliber "out there?"
Personally, in case of zombie apocalypse, my plan is to "bug in." Nevertheless... over time, do I want to be limited to one caliber and risk it not being available? I think diversification is a better strategy.
I will be adding 10-mm to my "stable" of calibers in the future.
I also need to replenish my ammo after the scamdemic drought, during which I actually increased my ammo use due to this blasted building hobby!
In the end, this is likely more about how to stay supplied during an ammo supply drought than it is the zombie apocalypse.
What is your philosophy or strategy?