Twist rate

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Wachsmann, Jan 17, 2013.

  1. Wachsmann

    Wachsmann Well-Known Member

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    In the future I want to get my Sendero rebuilt. I'll be going with the 7mm ultra mag for my choice. I would like to primelry set the gun up to shoot the 180 VLD's for long range. What is the preferred twist rate or best twist rate and length of barrel to get the best performance out of this combo....any experienced or susgestions are welcome. The gun I currently have is a 300 ultra mag.
     
  2. 7stw

    7stw Well-Known Member

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    A 1 in 9 is said to be adequate for 180 bullets.
     

  3. Greyfox

    Greyfox Well-Known Member

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    I'd go with a 1:9 for the Berger 180's.
     
  4. BEEMAN

    BEEMAN Well-Known Member

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    1:8 for the upcoming 195 Berger.
     
  5. wyld

    wyld Member

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    A 1:8 should work. You can calculate the exact twist rate by using formulas from various sources. The best source I have found is from the book, "Sporting Firearms, A Designers Notebook" obtainable from Amazon.com It has a companion CD with several programs, one of which has the most popular twist formulas which allow you to enter the data and the program produces the result for you.
    RF