Mental exercise. Least number of guns, highest number of ammo options.

checkmyswag

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For instance. A .357 revolver can shoot .357 mag and .38 special.

So that's one gun, 2 rounds.

Taurus Judge .45 LC and .410 shotgun shells.

What other examples are there?

No switching barrels!
 
.327 Federal: .32 Auto, .32 S&W, .32 S&W Long, .32 H&R, .327 Federal. (5 cartridges in the same chamber.)

.22 Long Rifle: .22 Short, .22 Long, .22 Long Rifle. (3 cartridges.)

.44 Remington Magnum: .44 Special, .44 Mag. (2 cartridges.)
 
The Philips and Rogers Medusa Model 47 is a unique revolver that will safely fire just about every handgun cartridge in the .35 cal range.

The original list is only 25 different calibers, although some claim more.
 
S&W Governor: 410, 45 Colt, 45ACP

Not a barrel switch but with a cylinder switch, the Ruger Single Six will do .22 short, long, long rifle, and magnum.
 
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.357 Maximum revolver -- .357 Magnum, .38 Special, .38 Long Colt, .38 Short Colt.

Also 5.

And, you can generally also get the .38 Automatic and the .38 Super to chamber and fire in a .357 Magnum or .357 Maximum because of the small, but usable, rim on those cartridges.

So, in reality, 7.


".22 Long Rifle: .22 Short, .22 Long, .22 Long Rifle. (3 cartridges.)"

Add the .22 CB cap and the .22 BB cap, which are considered to be separate cartridges.


".44 Remington Magnum: .44 Special, .44 Mag. (2 cartridges.)"

.44 Russian will also chamber and fire just fine in a .44 Magnum.

There's also a super .44 Magnum, can't remember what it's called, basically the .44 version of the .357 Maximum. .445? Something like that?
 
Then, of course, you have a rather unique item from Hollywood's golden age of westerns, the 5-in-1 blank.

It was designed to be used in revolvers chambered for .45 Colt, .44-40, and .38-40, and rifles chambered in .44-40 and .38-40. That's where the 5 comes from.
 
"Also, with the .357 Maximum, don't forget the .38-44 Heavy Duty. That makes it five/"

The .38-44 HD cartridge uses a .38 Special case, so to my way of thinking, it's only a .38 Special loading variation, just like the .38 +P or .38 +P+, and thus does not qualify as a separate "round."
 
Don't forget the CB long.
There's also the .22 Extra Long if (a) it's a revolver with long chambers or an old .22 bolt-action chambered for this cartridge, and (b) you can find some of this rare ammo. ;)
 
How about a TC Contender with various barrels. I know it is a single shot but it is a handgun and can take multiple calibers with the right barrel.
 
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