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Caliber

Caliber is a term used to describe the internal diameter of a cylindrical object, most commonly the inside diameter of a gun barrel or firearm bore. It is typically measured in inches or millimeters.

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  In firearms, caliber indicates the diameter of the bullet or projectile that can be fired from the barrel (e.g., a .45 caliber means the barrel’s internal diameter is 0.45 inches).

  
  
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  In other contexts, such as engineering or piping, caliber can refer more generally to the diameter or thickness of tubes or cylindrical objects.

  
  

Key points:

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  Caliber = internal diameter of a barrel or tube

  
  
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  Measured in inches or millimeters

  
  
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  Important for firearm specifications and ammunition compatibility

  
  
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  Also used in engineering and manufacturing

  
  

Caliber is crucial for matching ammunition to firearms and for defining performance characteristics like velocity and accuracy.