As big as someone aspires to make it, I suppose.
.857
Rifles: Lowest caliber = .357, highest caliber = .44mag Pistols: Lowest caliber = .38, highest caliber = .454mag or a .50AE
The highest caliber machine gun in standard use is the .50 Cal. Gatling guns are used in 20mm caliber. XXXXXXXXX Russia and China use a heavy machine gun larger than the .50 cal BMG- it is the Vladmirov KDV (for the Russians), in caliber 14.5mm x 115.
the 12 guage is a caliber not a gun
The short answer is no. The longer answer is, you may be able to get a .25 cartridge into a .22 caliber gun, but it will likely jam and be very difficult to get out, and if it fires, it will probably damage the gun and possible the shooter. The .25 has a larger diameter than the .22.
a .45 caliber.
Anywhere from $5 to $5,000. Value of a gun is based on the exact make, model and condition. No information = no answer possible.
What caliber of man are you looking for? What caliber of gun are you looking for?
The short answer is no. The longer answer is, you might be able to get a .40 caliber cartridge to fire from a .45 caliber gun, but it may damage the gun, and even if it doesn't damage the gun, it will cause other problems. In general (with only a few exceptions) you should never try to fire any cartridge in any gun other than a gun designed for that caliber.
Caliber has nothing to do with it.
smaller the number, the smaller the caliber.
It is the standard .68 caliber