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Rifling Angle to Bullet?

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  #1  
Unread 12-18-2009, 11:53 PM
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Rifling Angle to Bullet?

Here's three barrels:

22 caliber (.224" groove diameter), 1:8" twist.

30 caliber (.308" groove diameter), 1:11" twist.

44 caliber (..448" groove diameter), 1:16" twist.

Which one has the greatest angle the rifling presents to the bullet?
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  •   #2  
    Unread 12-19-2009, 12:55 PM
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    Re: Rifling Angle to Bullet?

    Quote:
    Originally Posted by Bart B View Post
    Here's three barrels:

    22 caliber (.224" groove diameter), 1:8" twist.

    30 caliber (.308" groove diameter), 1:11" twist.

    44 caliber (..448" groove diameter), 1:16" twist.

    Which one has the greatest angle the rifling presents to the bullet?

    The 1 in 8 twist.

    The faster the twist the greater the angle.

    Twist rates are based on the inches it takes for the bullet to make one full revolution=
    1in 8 = 1 reveloution in 8" and so fourth.

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      #3  
    Unread 12-19-2009, 04:08 PM
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    Re: Rifling Angle to Bullet?

    All the same angle.
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      #4  
    Unread 12-19-2009, 08:04 PM
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    Re: Rifling Angle to Bullet?

    The factors here amount to circumference traveled per bore travel
    [2 sides of a triangle]

    InvTan(Pi*Diameter/Travel)
    All three are ~5 degrees
    (I think)

    Last edited by Mikecr; 12-19-2009 at 08:10 PM.
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