Caliber and bore are used interchangeably nowadays. There are technical differences you can find in the dictionary if you wish.
The word "caliber" refers to the diameter of the internal bore of a gun or firearm barrel.
It depends on the caliber of the bullet.
If you're talking about firearms, caliber refers to the diameter of the bullet or the bore size of of the gun.
A 50 caliber gun, or more properly, a .50 caliber gun is a firearm having an internal bore diameter of 1/2 or .50 of an inch.
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.
A 22 caliber rifle is a firearm and a BB gun is an air gun (Not a firearm) Now if you are asking about a .22 caliber air gun then the difference is in the size of the projectile. A BB is a hard round .175 caliber ball. The .22 caliber is a larger size pellet.
I believe that a cannon has a larger caliber than a machine-gun.
Cannon is a term typically used to denote a weapon with a bore of 20mm or greater.
Stevens 30 caliber rim fire is not a true 30 caliber. Chamber is .296. Bore .270 t0 .277. I found a 30 caliber rim fire round, at a gun show. It did not measure out to a 30 cal. Shot shooter
Caliber refers to the diameter of the bullet the gun is designed to fire. When referring to cannon, caliber may be used to indicate the barrel length. A 5 inch 38 caliber Naval gun fires a 5 inch diameter shell from a barrel that is 38 calibers long- or 38 times 5 inches (190 inches, or 15.83 feet) Please note that with a handgun or rifle, caliber referring to bore diameter is a fraction- such as .308, .45, etc. With cannon, it is a whole number, and given along with the bore diameter in inches.
Caliber is the size of the barrel's inside diameter, in fractions of an inch. A .25 caliber pistol fires a bullet that is about 0.25 inches across. Pistol can range from very small (about 10 caliber) up to very large (75 caliber) and there are hundreds of different cartridge sizes in between.
Calibre refers to the diameter of the barrel of a gun. Also known as the bore. It is referred to in imperial measure or metric depending on the manufacturer