I can easily get five uses from .308 brass and twice that from pistol brass, therefore powder, bullets and primers are calculated based on number and life of brass on hand.
Except for rimfire, there is not a single caliber that I own that I do not reload for, even .380 ACP. I found a 119 grain bullet that works well for .380 and 9mm. I also have a supply of raw material and molds for making bullets for each caliber. My hero after the Quigley character, in the Quigley Down Under move, is the gunsmith in the movie. ;)
While factory ammo is fine for 99.9% of the shooters out there, there is no equal to handloaded rounds when put together by a talented reloader with the right equipment. Take apart a few factory rounds someday and weigh the powder and bullets and measure the cases and bullets. You'll be shocked at the variances.
You get a big improvement in accuracy reusing the brass fired in the same rifle when it's a bolt action by just resizing the neck; only by reloading is this possible.
I bet you already know all of this. I just want to put it out there for those who don't.
Btw, make sure your inventory meets your local and state ordinance and fire marshal requirements. Let's ensure our full compliance with applicable laws and regulations so that we may serve as an example to those who disregard our laws such as the current administration. :)
I don't have a local fire marshal. With that said, I hope my garage never catches on fire. LOL. As for what local laws and regulations have to say about our 2nd Amendment and God given rights, I choose God and I will continue to live that way to serve as an example to freedom and liberty. My original question was about what type of inventory that I should build up. Until I understand that, or the question of availability of components is resolved, I will just continue to make ammo. The constraint is cost.