Long Range Hunting Online Magazine

Go Back   Long Range Hunting Online Magazine > Hunting > Long Range Hunting & Shooting

Long Range Hunting & Shooting Nightforce Optics


twist rate help

LinkBack Thread Tools Display Modes
Unread 02-09-2011, 04:56 AM
Silver Member
Join Date: Dec 2010
Posts: 360
twist rate help

ok ive been stuck on this question for a while and dont even really know how to ask it but im going to try, for a 30 cal. 240 gr SMK the recommended twist is 1-9 so if i bought a 1-9 twist barrel and dident like the bullets what would be the outcome if i bought matrix or berger 210 grain bullets where theyre twist rate is 1-11 and switched to them? would it kill accuracy? thanks for your help guys.
Reply With Quote
  •   #2  
    Unread 02-09-2011, 05:37 AM
    Silver Member
    Join Date: Sep 2008
    Posts: 327
    Re: twist rate help

    Whilst i cannot say ive ever shot 210`s from a 9 twist, theory says that with match quality bullets you would barely notice the difference in accuracy from the higher twist rate alone. A lower stability factor is better, but your really starting to split hairs with this line of thinking.

    For example, i shot 155gr palma match bullets from my .308 which happened to have 10twist barrel so i could also shoot the heavier bullets aswell. The preferred twist for these competition bullets in match rifles is 1:13. The bullets still shot exceptionally well for me, many groups were sub 1/4MOA when i did my part.

    Benchrest shooters looking for every last ounce of accuracy will nearly always choose the slowest twist possible for that bullet, but these guys are chasing every last 0.1MOA they can get. So i don think its worth worrying about when considering a long range hunting application. You will get far more dispersion from many other factors you have to deal with. This means you will effectively not notice its effects.
    Reply With Quote

    Unread 02-09-2011, 07:51 AM
    Bronze Member
    Join Date: Aug 2010
    Posts: 54
    Re: twist rate help

    A tighter than optimum twist will hinder your ability to get your highest velocities. Too tight a twist will cause bullet blow ups in ultra high velocity rounds (not going to be an issue here) A good thing is the extra RPM of the bullet will cause a more dramatic effect on a tissue target
    Reply With Quote
    Unread 02-09-2011, 09:34 AM
    Platinum Member
    Join Date: Apr 2010
    Location: Allen, TX
    Posts: 2,608
    Re: twist rate help

    Notwithstanding benchrest accuracy concerns as described above, some people beleive that overstabilizing is better than understabilizing.

    You can always back down from max velocity to avoid shreading bullets, but you'll have to rebarrel to get a faster twist.

    If you think speeding up your bullet in a slow twist barrel will increase the rpm enough to stabilize it, then check your math. A few hundred fps does nothing for rpm compared to 1 in 10" vs 1 in 9".

    This is my understanding/opinion from a lot of reading and a little experimentation. But, you may want a more qualified source than me.
    Reply With Quote


    Thread Tools
    Display Modes

    Similar Threads for: twist rate help
    Thread Thread Starter Forum Replies Last Post
    Best rate of twist for 243. win matt_3479 Long Range Hunting & Shooting 8 07-27-2013 09:48 PM
    Twist rate ? 6mm Rifles, Bullets, Barrels & Ballistics 6 09-25-2009 12:01 PM
    Rate of Twist nate-lab Rifles, Bullets, Barrels & Ballistics 2 02-21-2009 08:54 PM
    243 Twist Rate kdog70 Long Range Hunting & Shooting 11 02-18-2009 11:00 PM
    Twist rate of a CZ 527 OKbow87 Rifles, Bullets, Barrels & Ballistics 2 11-16-2006 12:02 PM

    All times are GMT -5. The time now is 09:54 AM.

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