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Barrel twist

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  #1  
Unread 05-18-2002, 06:05 PM
Taz Taz is offline
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Barrel twist

Hey ya'll!

I need some info on barrel twists for 30 cal. JLK 190 & 210. I know the 10 twist is norm, but would the 11 twist be better? [img]images/icons/confused.gif[/img]
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  •   #2  
    Unread 05-18-2002, 08:05 PM
     
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    Re: Barrel twist

    Taz--
    What cartridge /velocity are you using? CJ
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      #3  
    Unread 05-18-2002, 09:41 PM
    Taz Taz is offline
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    Re: Barrel twist

    I am using the 300 wsm. Velocity - I'm guessing 2950 to 3050.
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      #4  
    Unread 05-19-2002, 08:40 AM
     
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    Re: Barrel twist

    Taz -- I forgot to ask the bullet length, so try this formula--
    (180 x bullet dia x bullet dia)/ bullet length = rate of spin. If your velocity is below 2800 fps, use 150 instead of 180 as your constant. CJ
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      #5  
    Unread 05-19-2002, 10:29 AM
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    Re: Barrel twist

    Chris,

    What formula do you use to determine your first number ( 180 or 150 ) versus Velocity?

    I was thinking that with the formula you gave, I might be able to reverse it when working up new loads. With a known twist, it might help me look for a specific window of velocity for best bullet performance. But I can't find how your beginning numbers relate to the bullets speed.
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      #6  
    Unread 05-19-2002, 10:40 AM
     
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    Re: Barrel twist

    Tim-- Good Question-- I pulled it off of one of the ballistics sites and I don't remember which one. I'll try to find it and get back to you. I don't remember seeing the formula, just the numbers given as constants. I'll try to look it up tonight. Chris
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