Ok, I understand having a supply on hand ....for practice, for the kids to shoot, grandkids, etc ...
and because I reload and shoot a lot / I may have 500 - 10,000 rds on hand for any given caliber. ( I just finished reloading 6,000 rds of 124 gr 9mm last week ) because I shoot it a lot / and I need about 4,000 for a 3 day class coming up. For calibers I don't shoot too much / like .40S&W I only keep about 1,000 rds in inventory. When I get down to 250 rds / I start reloading that caliber again and stock back up ....but if you want to stockpile 2,000 rds per caliber ....just stock jacketed, RN bullets ...(they stop bad guys too / if you hit them in the right spot ! )
I'm more of a glass half full guy ....and if I ever need more than a few hundred rounds of my primary defensive ammo ....there are bigger issues.
A good reloading press, like the 650, can crank out 1,000 rds an hour ...so if you kept a few cases of bullets, some powder around, primers .... you can crank out a few thousand rounds in a few hours .... It just makes more sense as a contingency / if you're really worried about it ...but personally I'm not.