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

How to measure barrel twist?

LinkBack Thread Tools Display Modes
  #1  
Unread 01-16-2004, 08:34 AM
PUBLISHER
 
Join Date: May 2001
Posts: 6,515
How to measure barrel twist?

I know what twist is, of course, but how do you measure twist on a rifle's barrel?
__________________
- -
Long Range Rifles, LLC - Ready To Ship

.
Reply With Quote
  •   #2  
    Unread 01-16-2004, 08:54 AM
    Platinum Member
     
    Join Date: Jul 2003
    Location: Central PA
    Posts: 1,307
    Re: How to measure barrel twist?

    First you need a swiveling cleaning rod whinch im sire you have. Put index marks on the rod handle and rod.--right at the rear where the rod goes into the handle (bore tech rods have this)

    then set up a ruler zeroed at another index mark further down on the rod.

    then push the rod in till the marks on the handle/rod line up with 1 revolution. look back at the ruler and see how far that index mark advanced from where it started.

    clear as mud?

    just make sure you keep the handle in the same orientation as you are pushing it in.

    JB

    [ 01-16-2004: Message edited by: jb1000br ]
    __________________
    Check it Out!!--> Shoot the Smack The Smiley Match...and help AmericanSnipers.org
    Reply With Quote

      #3  
    Unread 01-16-2004, 11:26 AM
    JR JR is offline
    Bronze Member
     
    Join Date: Jan 2004
    Location: Langholm, Scotland
    Posts: 96
    Re: How to measure barrel twist?

    Len,

    Here's how I check 'em at work..take yer cleaning rod and push a tight patch about 3/4 the way to the barrel muzzle..You using a bore guide? well, take a piece of masking tape and wrap round the cleaning rod where rod meets bore guide, or where it meets back of the action, whatever, and wrap it so it looks like a little flag, sticking up at 12 o'clock..Pull the rod back by handle only, make sure it isn't slipping, pull until that flag is again at 12 o'clock..now take your measuring tape and measure from the front of the tape to the back of the bore guide, and that should give you a good idea of the twist rate..

    JR
    Reply With Quote
      #4  
    Unread 01-16-2004, 03:30 PM
    Platinum Member
     
    Join Date: Jun 2001
    Location: Palmer, Alaska
    Posts: 2,539
    Re: How to measure barrel twist?

    I do what JR does exactly. I just do it from the muzzle end (carefully) wrapping a patch on a plastic brush so it fits tight. Push it all the way in so it's conformed and following the rifling perfectly. Then I put the "flag" of tape ( I use the colored MTM cartridge box lables) that JR mentioned flush with the muzzle and at 12 o'clock, withdraw the rod for 1 revolution exactly and measure. If you're anal about it, place another flag here too, and withdraw another revolution to compare and see how consistant the twist rate is for the length of the barrel, repeat if necessary for longer barrels.

    Twist consistancy could be another good topic. [img]images/icons/smile.gif[/img]
    __________________
    Brent Moffitt
    Reply With Quote
      #5  
    Unread 01-16-2004, 03:43 PM
    JR JR is offline
    Bronze Member
     
    Join Date: Jan 2004
    Location: Langholm, Scotland
    Posts: 96
    Re: How to measure barrel twist?

    Brent,

    Twist consistency, or try this one, how do you measure a 38" twist in a 20" barrel...nah, that's too easy, instead of taping at 12 o'clock, tape at 6 and pull 19" back...twist consistency you might want to use a cerrosafe cast and some math, ha..

    JR

    [ 01-16-2004: Message edited by: JR ]
    Reply With Quote
      #6  
    Unread 01-18-2004, 02:46 PM
    Bronze Member
     
    Join Date: Jan 2004
    Location: Austin, Texas
    Posts: 75
    Re: How to measure barrel twist?

    I've never gone wrong with the cleaning rod and patch method. Works every time for me. Only problems i've ever had was with bbl's twisted at fractional rates (i.e. 1:9.5" etc..) Also, method doesn't work for gain twist bbls.

    TH
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes


    Similar Threads for: How to measure barrel twist?
    Thread Thread Starter Forum Replies Last Post
    Even Lower Prices: Reloading Dies, Quick Measure Powder Measure afp1 Reloading Equipment and Components 13 01-16-2012 03:42 PM
    6mm re-barrel brand,length and barrel twist mcseal2 Rifles, Bullets, Barrels & Ballistics 12 11-07-2010 08:14 PM
    How to measure a barrel stevenwoll Rifles, Bullets, Barrels & Ballistics 3 03-20-2009 09:38 AM
    which break, barrel length, barrel cotour, and twist? nathank Rifles, Bullets, Barrels & Ballistics 1 02-03-2009 08:31 PM
    Quick Measure Powder Measure Swift One Reloading 3 01-19-2007 10:23 AM


    All times are GMT -5. The time now is 05:46 AM.


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