.001 inches. Makes a difference depending on what you are shooting, how old the barrel is, etc..
That would depend on the caliber, and type of bullet, the rifle uses.
It should be marked on the barrel.
Any that have the appropriate sized barrel
a bullet of the same caliber and same grains of powder fired from a long barrel will have a higher muzzle velocity than if fired from a short barrel.
It MAY refer to a .32 caliber firearm. The bullet is 32/100ths of an inch in diameter.
Caliber (or calibre) is a measurement of the inside diameter of the barrel, and is also used to refer to the particular cartridge fired by a given gun. A .45 caliber gun fires a bullet that is ROUGHLY .45 inches in diameter. A 9mm uses a bullet that is ABOUT 9mm in diameter.
Carbine does not actually refer to the bullet but rather the barrel of the rifle. It is a shortened, lighter barrel, which is easier to carry in adverse conditions (forest, scrub, jungle, etc.).
Impossible to answer without knowing the caliber, bullet weight, barrel length.
The word "caliber" refers to the diameter of the internal bore of a gun or firearm barrel.
It's a .30 caliber bullet.
A 22 caliber bullet is 22/100 inches in diameter. A 7.62 mm bullet is 30 caliber or 30/100 inches in diameter there is no such thing as a 7.62 caliber bullet