Welcome guest, is this your first visit? Create Account now to join.
  • Login:

Welcome to the NZ Hunting and Shooting Forums.

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed.

DPT Delta


User Tag List

+ Reply to Thread
Results 1 to 12 of 12
Like Tree3Likes
  • 3 Post By tui_man2

Thread: Is there a down side to fast twist barrels?

  1. #1
    Caretaker Wildman's Avatar
    Join Date
    Dec 2011
    Location
    Selwyn District
    Posts
    2,842

    Is there a down side to fast twist barrels?

    Say if one wanted a 6mm barrel chambered in a moderate chambering, is there a down side in using a barrel that has a twist rate from the upper end of the spectrum? Say 1:7"?

  2. #2
    Member mucko's Avatar
    Join Date
    May 2012
    Location
    Tauranga
    Posts
    12,624
    By my play on JBM it seams to make it more stable. but at a guess there would be a limit to how fast you could spin it before roasting the copper. then theres monolithic where you wouldnt have the worry of the bullet destroying its self

  3. #3
    Member Beavis's Avatar
    Join Date
    Dec 2011
    Location
    Taupo
    Posts
    4,833
    More friction, lower speed, maybe more fouling, over spinning some bullets (can fly apart).

  4. #4
    Terminator Products Kiwi Greg's Avatar
    Join Date
    Dec 2011
    Location
    Nelson
    Posts
    6,499
    Quote Originally Posted by Wildman View Post
    Say if one wanted a 6mm barrel chambered in a moderate chambering, is there a down side in using a barrel that has a twist rate from the upper end of the spectrum? Say 1:7"?
    Not with a moderate chamber.

    I wouldn't want to try 40 grainers at 4500fps in my 1-7, 22-243.

    The 53 Vmax goes fantastic in 1-8 twist 22 Terminator at 3700fps

  5. #5
    Not just an internet expert... The Claw's Avatar
    Join Date
    Dec 2011
    Location
    Gore
    Posts
    2,051
    Quote Originally Posted by Beavis View Post
    More friction, lower speed, maybe more fouling, over spinning some bullets (can fly apart).
    What he said...

    Sent from my HTC One X using Tapatalk
    If it's not a first round hit you need to practice more

  6. #6
    Caretaker Wildman's Avatar
    Join Date
    Dec 2011
    Location
    Selwyn District
    Posts
    2,842
    Hmm thanks guys.

    But I'm guessing that wouldn't be as much of an issue with projectiles needing almost as fast a twist, say 1:8" or 1:9"?

  7. #7
    Member Beavis's Avatar
    Join Date
    Dec 2011
    Location
    Taupo
    Posts
    4,833
    If your goal is to stabilize long bullets then the cons aren't really relevant.

  8. #8
    AB Precision
    Join Date
    Dec 2011
    Location
    Nelson
    Posts
    2,209
    And a bit of rpm really adds to the damage on the animals

    Sent from my GT-I9300T using Tapatalk
    veitnamcam, Smiddy and Matt2308 like this.

  9. #9
    Not just an internet expert... The Claw's Avatar
    Join Date
    Dec 2011
    Location
    Gore
    Posts
    2,051
    Best to slightly over spin (stabilise) a projectile than the over way. If you need a 1 in 9 but use a 1 in 8 then all good. But if you only need a 1 in 12 and use a 1 in 7 then the cons above would apply. If you are going to the trouble of rebarreling something then you should use an appropriate twist for the projectile you plan to use

    Sent from my HTC One X using Tapatalk
    If it's not a first round hit you need to practice more

  10. #10
    Member
    Join Date
    Mar 2012
    Location
    Hastings
    Posts
    2,316
    Some projectiles redesigned or require a fast twist i.e. Barnes.

  11. #11
    LJP
    LJP is offline
    Member
    Join Date
    Jan 2012
    Location
    Auckland
    Posts
    721
    Speaking from experience (think expensive, hard learnt lessons) use the slowest twist barrel that will stabilise the heaviest bullets that you intend to shoot. Using a faster twist where not required limits velocity & on occasion accuracy as well. The difference a faster twist makes on projectile expansion is sweet F#&k all!

  12. #12
    Member
    Join Date
    Sep 2013
    Location
    Paremoremo
    Posts
    66
    The difference a faster twist makes on projectile expansion is sweet F#&k all!
    This is true. There is a myth about that driving a bullet faster in a slow twist barrel will stabilize a bullet better - not true. Some bullet shapes will be slightly more stable at higher velocities but others not. However there is a big difference with bullets that go transonic within the target range and some subsonic bullets shapes require more stabilization but not all. This is why subsonic 22lr's are more accurate than HV's.

 

 

Similar Threads

  1. How fast is your auto charger?
    By andyanimal31 in forum Reloading and Ballistics
    Replies: 2
    Last Post: 29-12-2013, 10:58 AM
  2. Replies: 7
    Last Post: 23-02-2012, 02:32 PM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Welcome to NZ Hunting and Shooting Forums! We see you're new here, or arn't logged in. Create an account, and Login for full access including our FREE BUY and SELL section Register NOW!!