Rifled barrel- size of the groove.

Discussion in 'Gunsmithing Forum' started by dragd99, Nov 21, 2013.

  1. dragd99

    dragd99 New Member

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    topic can be deleted

    topic can be deleted
     
    Last edited: Nov 24, 2013
  2. c3shooter

    c3shooter Administrator Staff Member

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    An unfired .25 Auto bullet is about .251. It will be pushed thru a barrel slightly smaller in diameter than that. Each groove is ABOUT 1-2 thousandths of an inch deep. So a barrel with an even number of lands and grooves would have a barrel where bottom of groove to bottom of groove (your red line above) would be 2-4 thousandths greater than top of land to top of land (blue line above).

    The number, shape, depth and width of the groove in rifling will vary from caliber to caliber. For instance, not all grooves are square- some look like a triangle.
     
    Last edited: Nov 21, 2013

  3. robocop10mm

    robocop10mm Lifetime Supporting Member Lifetime Supporter

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    different makers use different rifling depth and twist rates. Within a single maker there can be large variances in dimensions. The only way to know is to slug your barrel and measure
     
  4. Mercator

    Mercator Active Member

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    Manufacturers have experimented with all sorts of rifling, but to this day none has been proven fundamental to accurate shooting.