Interesting way to look at a collection..../ but my suggestions:
1. within each caliber / I'd consider adding barrel length and frame size....
( K frame S&W mod 19 in a 4" / a N frame mod 27 in a 4" are both chambered in .357 Mag )....but there is a big difference in my mind between a K, L and N frame...even in the same caliber.../ what you prefer is up to you.../ same thing in .44 Mag ...S&W 629's and 29's are all N frames but what do you like in a 3", 4", 6", 8 3/8" barrel .....
2. finish is interesting.....Nickel, stainless, blued...might want to add that as a "category"...
3. 1911's .... different calibers ( at least a 9mm and a .45 acp )....but same issue on barrel length, 3", 4" or 5"....or steel or alloy frames....
So, in my revolvers....I'd want to view my K frames, L frames and N frames separately ...by caliber, by finish, by barrel length.../ so I tend to start with caliber, then Frame, then barrel length, then finish....in evaluating my DA - SA revolvers...( I would also keep the S&W's apart from Colt or whatever other mfg's I wanted to collect ) ...if I wanted more than one mfg.
something like this( using my own preferences on S&W revolvers):
.......Barrel Lengths.........
.357 Mag..... 2 1/2" 4" 6" 8 3/8"
----------------
K frame 1(in 2 1/2") 2( in 4") 1 (in 6" ) 0 (in 8 3/8")
model 66(2 1/2") 66(4") 66(6") --
model -- 19N(4") -- -- ( use N for Nickel / B for blued)
L Frame -- --- 1 ---
model -- --- 686 --
N Frame --- 1(4") 2(6") 0 (8 3/8")
model NA(2 1/2") 27 N(4") 27 N(6") ---
model NA -- 28 B(6") --
Totals 1(2 1/2") 3(4") 4(6") 0( 8 3/8")
then graph it / or whatever....see the holes you might want to fill .. ???
a. do you like a .357 mag S&W in 8 3/8" ...or is it a hole you don't care about ??
b. models starting with a 6 ( are all stainless ) ...in S&W.../so no extra notes on those models ( but you know that).
c. you could add year mfg'd...or engineering dash number...( like a 27-2 N) just by widening the column a little....or 27-2-N- 1962 ....
d. you could add every barrel length available...like model 27's ...were made in 3 1/2", 4", 5", 6", 6 1/2" and 8 3/8"
just depends on how much detail you want at a glance....
Note: when I edit ....columns are all lined up / when I close it ...they all run together....but you get my drift probably....add some other info, to catch your eye....give yourself something to think about....