close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics

Reply

Barrel rate of twist

LinkBack Thread Tools Display Modes
  #1  
Unread 04-26-2014, 09:52 PM
Silver Member
 
Join Date: Apr 2013
Location: Methow, Wa
Posts: 105
Barrel rate of twist

When a bullet manufacture states the rate of twist for a bullet ,example 1-12 twist or better for 185 VLD are they saying that 1-12 is optimum for that bullet and anything faster will work?

I recognize some bullets do better at a faster RPM than others but are they really saying 1-12 is the best for that bullet?
Reply With Quote
  •   #2  
    Unread 04-26-2014, 10:02 PM
    Platinum Member
     
    Join Date: Dec 2013
    Location: End of the Oregon Trail
    Posts: 2,050
    Re: Barrel rate of twist

    They are pretty much saying that is the slowest twist that will stabilize the bullet. Not the optimum.

    Below link is to the Berger twist calculator. It is pretty informative. Plug in some numbers and see what you get.

    http://www.bergerbullets.com/litz/TwistRuleAltWP.php
    Reply With Quote

      #3  
    Unread 04-26-2014, 10:36 PM
    Silver Member
     
    Join Date: Apr 2013
    Location: Methow, Wa
    Posts: 105
    Re: Barrel rate of twist

    Thanks. Just got my .300 WM back from rebarreling and discovered they installed a 12 twist. Not sure how that will work out. I want to use 185 and 190 VLD and some 215. Wonder if I'll have to start over cause it should probably have been 10 or 11 at best. At this point all I can do is break it in and try it out for a while.
    Reply With Quote
      #4  
    Unread 04-26-2014, 10:44 PM
    Platinum Member
     
    Join Date: Dec 2013
    Location: End of the Oregon Trail
    Posts: 2,050
    Re: Barrel rate of twist

    On the bright side, it will probably give you some good speeds with lighter bullets.
    Reply With Quote
      #5  
    Unread 04-27-2014, 12:31 AM
    Official LRH Sponsor
     
    Join Date: May 2001
    Location: Ewardsburg, Michigan and Port Elizabeth, South Africa
    Posts: 127
    Re: Barrel rate of twist

    The spec for a 300WM is 1:10" twist. A 12" twist turns it into a paper and steel rifle and it is not a hunter unless you limit the distance by using shorter bullets.

    The twist calculator on the Berger page works very well with jacketed lead core bullets. It does not do well with turned copper bullets. For turned copper, use this calculator which works with any type of bullet construction.

    NPS Home
    __________________

    GS Custom Bullets USA
    Reply With Quote
      #6  
    Unread 04-27-2014, 10:55 AM
    Platinum Member
     
    Join Date: Jan 2003
    Location: The rifle range, or archery range or behind the computer in Alaska
    Posts: 3,819
    Re: Barrel rate of twist

    Fortunately, the 12x works very well with 185-200 grain bullets. 215 no but up to 200 yes. And as GS pointed out, only in regards to jacketed lead and not solid copper.
    __________________
    __________________
    Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
    Reply With Quote
      #7  
    Unread 04-27-2014, 11:28 AM
    Official LRH Sponsor
     
    Join Date: May 2001
    Location: Ewardsburg, Michigan and Port Elizabeth, South Africa
    Posts: 127
    Re: Barrel rate of twist

    Thanks Michael. Berger must have a margin of safety in their twist recommendation. Good to know.

    All Bullets | Berger Bullets
    __________________

    GS Custom Bullets USA
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes



    All times are GMT -5. The time now is 05:40 AM.


    Powered by vBulletin ©2000 - 2017, Jelsoft Enterprises Ltd.
    Content Management Powered by vBadvanced CMPS
    All content ©2010-2015 Long Range Hunting, LLC