Barrel length and twist question

Discussion in 'Long Range Hunting & Shooting' started by Rainy, Apr 15, 2019.


Help Support Long Range Hunting by donating:


  1. Danny Butler

    Danny Butler Well-Known Member

    Messages:
    82
    Joined:
    Nov 13, 2018
    Personally I think you are shorting yourself with the 150 in that caliber. The rifle twist is 1/10 from the factory. 1/10 is usually for 168 and heavier bullets. I wouldn’t shoot anything lighter than a 180...I’ve hooked up hogs with my .300 win out to 948 yards with the 180.
     
    Rainy and SMK1000plus like this.
  2. FEENIX

    FEENIX Well-Known Member

    Messages:
    11,756
    Joined:
    Dec 20, 2008
    When you increase the weight, you increase the length, that is why it is part of the equation in Berger's twist rate calculator as montanarifleman noted. You can look at it as the length of the bullet but the weight is still a factor . In other words, both weight and length are factors in the twist rate to properly stabilize the bullet (SG).
     
    Rainy, SMK1000plus and L.Sherm like this.
  3. MontanaRifleman

    MontanaRifleman Well-Known Member

    Messages:
    6,194
    Joined:
    May 21, 2008
    Actually, if you increase or decrease the weight without changing the length you will have to change the twist to maintain the same SG (stability factor)
     
    Rainy likes this.
  4. DavidleeCole

    DavidleeCole Active Member

    Messages:
    44
    Joined:
    Nov 7, 2014
    I have the same gun and I put an lilja mark 13 on it 28" stock in cut and finished out at 28.75" its 1:10 twist 6 grove shoots great with 210 nos accbound LR with 80.6 gr of RL26 @3080ish. But the action is metric thread tell the gunsmith SK he will know before hand mine found that out and it cost me a lil extra for the time to set up the lathe and equipment. You will live the barrel
     

    Attached Files:

    Rainy likes this.
  5. just country

    just country Well-Known Member

    Messages:
    1,409
    Joined:
    Aug 6, 2014
    morning, run barnes bullets. cause of there construction a shooter
    can do a lot with the 165-168gr. TTSX, TSX and LRX bullets.
    I favor longer barrels #5-6 contour. added velocity is
    favored in the magnum calibers. twist is to ur liking.
    justme gbot tum
     
    Rainy likes this.
  6. pcmacd

    pcmacd Member

    Messages:
    18
    Joined:
    Apr 7, 2016
    What is your current twist? Not hard to figure with a wire brush and ball bearing handled cleaning rod. If it is working for you why not stay with that?

    If you plan to stay with 150 gr, an 11 or 12 would be ok, but you can't go wrong with a 10 twist, which is likely what you have now.

    I'd give the guys at Sierra a call; they won't care if you are using Nosler components.
     
    Rainy likes this.
  7. FEENIX

    FEENIX Well-Known Member

    Messages:
    11,756
    Joined:
    Dec 20, 2008
    Any changes in the bullet parameters will affect the others, i.e., if you change the weight you also change the BC, and thus affecting the SG.
     
    Last edited: Apr 18, 2019
    just country and Rainy like this.
  8. MontanaRifleman

    MontanaRifleman Well-Known Member

    Messages:
    6,194
    Joined:
    May 21, 2008
    Yup
     
    just country, Rainy and FEENIX like this.
  9. Gerard Schultz

    Gerard Schultz Well-Known Member

    Messages:
    150
    Joined:
    May 9, 2001
    Do not equate stable flight with correct terminal ballistics. To hunt with long bullets over long distances requires a long magazine box and a tight twist. Under 500 the twist does not matter if it is tighter than 1:10" but over 500 it does matter. I would go with a 9" twist and 26" barrel.
     
    just country, Rainy and FEENIX like this.
  10. L.Sherm

    L.Sherm Well-Known Member LRH Team Member

    Messages:
    1,222
    Joined:
    Jul 26, 2017
    Why would the O.P go anything faster than a 1-10 shooting 150 grain bullets or even if he went up to 215. Anything faster going 3400 hes just gonna take a chance of seeing dreaded " poof" with 150's.
     
    Rainy likes this.
  11. Gerard Schultz

    Gerard Schultz Well-Known Member

    Messages:
    150
    Joined:
    May 9, 2001
    That is only true if you use jacketed lead bullets. With copper monos it does not happen and you get the best of both worlds: Very close to the BC of the heavier bullet but the speed of the lighter bullet. Given that BC is a combination of form factor and speed, copper monos translate into very much the same wind drift as a jacketed lead bullets but much flatter trajectory and sometimes a shorter time of flight.

    Under 500 a 1:9" twist will not hurt anything and over 500 he can use bullets as long as he likes, a 300 Weatherby will not work up the speed to disintegrate bullets but he will get correct terminal performance on animals.

    For one load to work, we will need to know how far the average shot is and what type of shooting is done: target/tactical or hunting.
     
    Rainy likes this.
  12. L.Sherm

    L.Sherm Well-Known Member LRH Team Member

    Messages:
    1,222
    Joined:
    Jul 26, 2017
     
    Rainy likes this.
  13. Gerard Schultz

    Gerard Schultz Well-Known Member

    Messages:
    150
    Joined:
    May 9, 2001
    And I said: "Under 500 a 1:9" twist will not hurt anything and over 500 he can use bullets as long as he likes, a 300 Weatherby will not work up the speed to disintegrate bullets but he will get correct terminal performance on animals.

    For one load to work, we will need to know how far the average shot is and what type of shooting is done: target/tactical or hunting."
     
    FEENIX and Rainy like this.
  14. L.Sherm

    L.Sherm Well-Known Member LRH Team Member

    Messages:
    1,222
    Joined:
    Jul 26, 2017
    Yardage has nothing to do with how many rpms the bullet leaves the barrel.
     
    Rainy likes this.