Caliber is a word used to describe the bore diameter of a gun. It is also informally used as a synonym to grade or rank.
It depends on what you mean by measure, but if you mean in regard to the "50 caliber" part, caliber is the diameter of the piece of lead.
30 caliber with 30 grains of powder
9mm IS the caliber. If you mean what is it equivalent to, it is approximately the same as a .38.
Caliber is the diameter of the bore of a firearm. It's expressed in hundredths or thousandths of an inch, as in .45 caliber or .380 caliber. Curiously, the actual diameter of a .38 caliber slug is 0.357 inch.
It denotes a type of 30 caliber ammunition adopted by the Military in 1906.
The term caliber is often used to mean "level of excellence." If someone uses this phrase, they mean he was a good employee.
the caliber or gauge
Well, it depends on what you mean. The caliber is "determined" at time of production based on whatever caliber the manufacturer wants it to be. The caliber can be determined later by looking on the barrel. The caliber will almost always be stamped somewhere on the barrel.
ABOUT 5.56mm. Depends on WHICH 22 caliber you mean- there are different size .22s.
If you mean how long is the cartridge for an AK47, it's 39 millimeters long. The caliber 7.62x39mm.
Depends on the application. If you mean power, the higher the caliber, the more powerful it is. for example, a .22 caliber rifle is much less powerful than a .50 caliber rifle.
Long Barreled Pistol