There is a lot to consider when doing an ROI analysis with regard to reloading and obtaining ammunition during a worst case civil crisis.
The reason to reload is to be able to make custom ammo that works better in your specific guns.
It
can also be less expensive, but you have to buy compnents in large quantities when they are inexpensive to beat the price of cheap factory ammo and you have to load 10's of thousands of rounds to amortize the reloading equipment costs.
If you are not going to shoot 50,000 to 100,000+ rounds in your lifetime and you are happy with the accuracy that you get from factory ammo, then you would probably be better to stock up on ammo so you have enough to ride out a 5-10 year time where ammo is hard to get or too expensive.
If you are not happy with the accuracy you get with factory ammo, then your only option is to reload your own so you can tune the load to your specific gun.
Powder and primers require hazmat shipping that adds $35 to $50 to each order.
To better amortize that, buy powder in 8lb jugs and order 6 at a time to max out a hazmat tag from powder valley or other online seller.
Same thing with primers. Order 50,000 primers to max out a hazmat tag.
Bullets are heavy but have no hazmat so you can order those 5,000 to maybe 20,000 at a time to get the best landed price.
Do NOT expect to be able to go to a local reloading store and buy a pound of powder and a couple 100 count boxes of bullets and expect to get anywhere close to the cost of factory ammo.
You
will spend more than factory ammo buying components in small quantities.
I invested heavily into reloading components 25ish years ago and I am still shooting my way through my stash.
I load 38spl or 9mm with cast lead bullets for $35 per 1000.
I load 9mm using plated bullets for $42 per 1000.
I can load 55gr ball 223 for about $75 per 1000.
I can load 147gr ball 308 or 30-06 for about $90 per 1000.
The problem is that these are 1990's to early 2000's dollars and I can't replace my components for even triple what I have into them.
So when I go shooting, I grin at how my investments are paying off, but dread the day I have to re-supply.