I solidified my collection a little bit..but not based on ammo really...but it is based on what I like to shoot by caliber ( so kind of the same thing ):
.45 acp 2 guns ( all 1911's)
.40 S&W 3 guns ( all Sigs )
9mm 4 guns ( two 1911's / 2 Sigs )
.44 Mag 3 guns ( all S&W)
.357 Mag 7 guns ( 6 S&W / 1 Freedom Arms)
.38 spl ( none ) but I shoot a little in ..357 mag - and for kids
.22 6 guns ( a mix Browning, S&W, conversion kits )
and I reload all 6 handgun calibers.....( so I keep about a case of bullets for each caliber I load on hand ....4,000 9mm, 2000 .45 acp, about 3,000 .357 mag...( which make up about 90% of my shooting )....
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12ga 5 guns ( 4 Browning / 1 Benellli )
20ga 1 gun ( Browning )
16ga 1 gun ( Westernfield )
28ga 1 gun ( Browning )
.410 1 gun ( Browning )
and I reload for 12ga, 20ga, 28ga and .410....( and about 20 bags of shot ...mostly 8's...but a few 9's and some 7 1/2's ...)...
( and powder and primers of course...) for all of the above...
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If I didn't like reloading....and wanted to keep it simple...( and as I get closer to 70 yrs old ....I've thought about downsizing everything - a little )...:
a. I'd keep a pair of Wilson 1911's - one in 9mm/ one in .45 acp
b. 4 Revolvers in .357 Mag..../ pair of K frames, an N frame, a Freedom Arms
c. Three 12ga shotguns .... 2 Browning O/U's & a Benelli semi-auto
and those guns, calibers, gagues....would meet all my needs for recreation, self defense and bird hunting....
and give the rest of the collection to the kids...