just in the guns that I own, and i will take with me when I move out, i have seven calibers.
.303 boltgun
.223 semi-auto
.30-30 levergun
.22 rifle
.45 pistol
20 gauge shotgun
12 gauge shotgun
I have 400 rounds of .303, on chargers, 40 rounds of which resides on my british pattern 37 web gear, along with 1 1911 magazine, a period hi power holster (which fits the 1911) , the period canteen, and the bayonet for the gun. this is stored in the backpack that attaches to the web gear, which is hung up in my closet. the rest of the ammo is in an ammo can, with the rest of the 80 gazillion chargers have for my number4mk1.
i have 200 rounds of .223, in magazines in my chest webbing, which is in my duffle bag which has all my "going to war" kit in it.
i have a bandolier for my 12 gauge, with 25 rounds on it in the closet, and the 20 gauge has a buttcuff on it.
i have belt kit for the 1911, which has a holster for the gun and extra loaded magazines, also in my going to war kit.
the 20 gauge has a loaded buttcuff on it.
the 30-30 has a box of ammo on a shelf in the closet, and i'm probably going to fill up an M1 garand belt with ammo for it.
i try to keep a set of LBE for each of my guns, so i can use them effectively, even if they aren't my primary guns, and i try to keep at least a couple hundred rounds on hand, even for guns that aren't the primaries.