There are only three calibers for which I've been stashing that I don't have firearms for. That said, I'll be selling many of them because I just don't need them all. This is a learning process for me and I'm just now coming to grips with logical caching of supplies. Indeed, I'll be pairing down the number of rounds I keep in most calibers except those I'll be shooting. I'll be buying a reasonable quantity of other popular calibers... mostly handgun.
After selling some nice firearms that I decide are redundant or I really don't need then I'll be buying a few "budget priced" pistols and long arms to stash... something like Hi-Point 9mm pistols and .45 ACP carbines (just a couple each). Those are strictly to barter/trade/sell/loan.
I'm not an "apocolypse guy" but I do know disasters can and do happen. BTW, I do understand being "mobile" but, IMHO, it's nearly always better to stay put where one has an excellent supply of everything needed. This is assuming there's no immediate danger nor severe property damage. Lastly, I'm not in the best of health so "bugging out" into the woods isn't something I can survive and I don't want to do that anyway.
Please allow me to clarify another point; My caching isn't just disater preparedness and isn't only for barter/trade. I know darned well ammo prices will increase probably well ahead of inflation. I believe ammo is a very fiscally sound investment. If/when state or federal taxes are imposed then I'm ahead of those too. In other words, I try to CYA (my A) in as many angles as is practicable.
At any rate, I think I have the answers to my original query. I'll buy a couple hundred rounds of brass and the reloading supplies for any "pricey/esoteric" calibers along with budget-priced but decent quality reloading gear.