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.
As big as someone aspires to make it, I suppose.
the 12 guage is a caliber not a gun
a .45 caliber.
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.
It is the standard .68 caliber
smaller the number, the smaller the caliber.
Caliber has nothing to do with it.
The word "caliber" refers to the diameter of the internal bore of a gun or firearm barrel.
Fifty caliber, but it is more of a toy than a paintball gun.