P.S. Allow me to anticipate some of your questions and answer them:
- No need to say I should standardize calibers. Remember, I added some made-up guns to this list. I am all over the standardized calibers.
- I have plenty of magazines (10 for battle rifles, 5 for pistols) and a spare parts kit (like firing pins and gas rings) for most of the battle rifles.
If I may. . .
While you state that you have "Plenty of magazines," I might still recommend you get a few more.
The AK mags are pretty solid, if you take care of them. Ditto the FAL mags.
Depending upon what brand of AR mags you have, 10 may not be enough. The magazine is the weakest point of the AR system, especially if you're using the military issue aluminum mags. IF you can find them, I'd snag on a couple of the MagPul PMAGS. I use my AR's almost every week and have gone through dozens of aluminum mags due to lip malformation, etc.
However, I have a good friend of mine who runs a gun shop with indoor range. They rent full-auto weapons and have been using three PMAG's for several years now. These magazines are loaded, fired and reloaded several times a day.
Plus, if magazines are banned tomorrow (or, more likely, on the 21st), you may never have the opportunity to get more. You may have to think that those 10 mags you have will have to last you the rest of your life. . .and those of your kids, if you have any.
As to the ammo question,
I generally recommend what Spartan has, but with a twist.
1000 rds per rifle, regardless of caliber/use
500 rds per handgun, regardless of caliber/use
1000 rds per shotgun (more because this is a working weapon, you can use it for hunting to gather food and, in a pinch, for defense)
Once this is established, what I recommend is to then just purchase a box of ammo whenever you get paid. For almost 20 years, I've gone down to where I find the lowest price and purchased a single (or more) box of ammo. One week it would be for a rifle, the next for a handgun, the next for a shotgun, etc.
I set these back and when I have enough to fill an ammo can, I pack them in, put in a dessicant and seal the can up with info on what's inside.
I also have a basic load of ammo and mags set aside for each firearm that includes the appropriate number of magazines and ammo to fill them completely. This way, if I only have a few seconds, I can grab a firearm and throw the bag over my shoulder and have a full load ready to go.
Some will say that this is entirely too much ammo to have.
Fine. But keep in mind that ammo may not be easy to get in a particular survival scenario. Some of your friends/acquaintances may not have enough on-hand, but you may be able to provide them with an appropriate amount. It is barterable (arguable with some people) and, if you store it properly, will last a very long time.
Ammo is like money. . .you can never have too much.