What caliber do you have the most guns?

I have half a dozen small 5 shot .44 Specials, 2 Bulldogs, 1 Taurus and 3 made by Rossi.

I think that I have 8 or 9 .22's. I also have 7 12GA shotguns.

I have nine in 9mm. and another eight in .22LR.

30-06 with 45 cap and 12 ga a close second.

$$ is the #1 limiter of my collection so far in life, at the moment most calibers I just have one of each but:

I have 6 .44 cal cap n ball black powder guns (addictive!)

I have 5 .22lrs (including handguns and long-guns, just so fun and cheap to shoot)

runners up are
I have 3 12-gauge shotguns all pump-action, (one was given to me unexpectedly)
I have two .45LC revolvers both SA (expensive to feed, but VERY fun and I look forward to getting-into reloading)

I have many of the main-stream commonly agreed upon as 'best' calibers, but only one of each so far besides those I mentioned. I believe my next purchase of a caliber that's already in my collection will be another .45acp which will make two for my collection. I am badly lusting for a Springfield M1a so that will very likely make it to my collection before another caliber I already own

22 caliber

2 pistols
3 rifles

The lowly. 22 is numero uno in my collection.

Next are. 45 Colt, 9mm, .45 ACP, .30-06, & .38/.357.

.22 3 handguns, 3 rifles

22 rimfire by a significant margin.

I have 11 .357 magnums.

4 - .22lr
3 - 9mm
2 - 45 colt
2 - 357 mag
2 - 380 acp
1 - 45 acp

12Ga, 22, followed by .357mags. and a smattering of other stuff

It's a tie with .22 and 30 CAL. I am ashamed to admit how many .22 firearms I own now that I bothered to counted them up. Let's just say that all of the extended family have at least a rifle and a revolver/pistol each in .22 that I have "loaned" them so that I don't have to clean them all myself.

Checking my records I have ar least 4 firearms in most of the calibers that I reload for, the exception is 500 S&W (ONLY 2).

.357 Mag-more of those than everything else put together

Tied between .357 and 9mm with .380 and .22lr coming in second

2-45acp
2-9mm
3-22lr pistols
2-22lr rifles
3-12 gauges
2-380acp

Wow I did not realize how many caliber copies I had. Oh well you can always use more.

I have 7 1911's and 2 XD-45's so 45acp would lead the pack, followed by .22.

8 22lr, 4 rifle's and 4 pistols

Four 12ga (one pump with rifled barrel, one SXS, two smooth bore pumps)

.357

2 S&W revolvers
1 Ruger revolver
1 Marlin carbine

6 - 357 Magnums
5 - 12 Gauge Shotguns
4 - 9MM

My duplicate calibers are: 22LR - three handguns, two rifles. .380ACP - two handguns. .38 Special - two snub revolvers. .357 Magnum - two revolvers.
So, with me, the 22LR still reigns.

.30 Caliber:

.30-06
M1 Garand (2)
M1903
M1903A3
M1917

.30 Carbine
M1 Carbine (2)

.30-30
Winchester Model 94

Tinpig

I'm tied at 4 between 9mm and .45 acp. I love those two calibers. 9's are fun for the range and carry well. The .45 is great for range fun as well as Home Defense.
.45's
xd 45 acp
glock 21
glock 30
sig c3 1911
9mm
xdm 3.8
xdsc
g26
g19
kel tec.....forgot about the pf9 hiding in the back of the safe, so I guess its 9mm for the win 5-4

.45ACP. Five 1911s, an AR15, and a semi-auto Thompson.

.22lrs in a second, with one 1911, an AR15, a GSG-5, Cricket, and 2 and two 10-22s