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In most cases, the distance between opposite lands inside the barrel gives us the calibre of the rifle. In the image, the distance between the lands is 243/1000ths of an inch so this is a .243 calibre firearm. Knowing this, we can purchase the correct ammunition for a firearm.

Firearm Bore
  • Unit 2 of 3
  • Topic 9 of 10
  • Page 2 of 9