what does this term mean?

calamitywood

March 25, 2005 06:40

What do they mean when someone says the barrel of a rifle has been counterbored?

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  22WRF

  March 25, 2005 06:48

  Counterboring is where the rifling has been drilled out, back from the crown of the muzzle. This was done usually when the firearm was being arsenal refurbished. The reason for counterboring is because of damaged rifling near the muzzle and this damage usually impacts accuracy greatly. The rifling at the end of the barrel is the most important to putting a good spin on the bullet as it exits the muzzle. The belief is that if you drill out the rifling back from the muzzle until you reach good rifling, this will improve accuracy greatly.
  
  
  

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  perry shooter

  March 25, 2005 06:49

  The end of the barrel is finished into what is commonly called the crown. These take many different designs . Bench rest shooters like a 11 degree counter bored crown picture a funnel . a true counter bore is when you have say a 22 cal barrel with a larger hole drilled into the end most times this is an attempt to repair a damaged barrel without makeing it shorter but some times it is used in high end target 22 rim fire guns because any thing after about 18 inches and the vel. starts to drop as all powder has been burnt this only applies to 22 rim fire.

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  calamitywood

  March 25, 2005 07:18

  Thank you for your response. very helpful.
  Sherwin

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