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Thread: 308 Twist rates v projectile weights ?

  1. #1
    Member viper's Avatar
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    308 Twist rates v projectile weights ?

    Much more knowledge on here than I have so I thought I would put the question out.

    I am looking at getting one of the Bergara single shot take down rifles in 308 win.
    They basically come in two options.
    1: 20 inch barrel with a 1/12 twist rate...or
    2: 16.5 inch barrel with a 1/8 twist.

    Either option will get suppressed with the 20 inch version probably chopped to 17 - 18 inchs as I want to take advantage of the take down feature and be able to fit it all in a backpack and only assemble it once required.

    I know the 1.8 will allow for heavier pills but will it stabilise pills down to 125gr ?

    Any advantages and disadvantages please let me know so I can make an informed decision on which version to get ....

    Cheers Viper

  2. #2
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    16" 1:12 twist sends 200gn cast sideways - lol
    viper and Hearties like this.
    I know a lot but it seems less every day...

    Due to the exorbitant cost of reloading components, warning shots will not be given.

  3. #3
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    I have the 16.5" version, I haven't tried 125gr but it's fine with 150s.

    The 16.5 doesn't have open sights, but if you chop the 20 I guess it won't either!
    Last edited by Cigar; 08-04-2022 at 02:29 PM.
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  4. #4
    Member Micky Duck's Avatar
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    it will work fine..the worst it will do is make them more fragile as they will be spinning faster...but you can slow them down if thats too much of an issue.
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  5. #5
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    I have no issues with a 1:7 12” barrel using 125 gr BT, TMK and SST. So a 1:8 should be fine.
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  6. #6
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    You've got it a bit backwards mate. The faster the twist, the heavier (longer) the bullets it will stabilise. The 1:8 twist is really fast - it'll have no problem at all stabilising 125gr (light, short) projectiles.

    Unless you plan on shooting subs, I'd get the 1:12. @flock has one for sale I think. 1:12 will stabilise everything supersonic up to 180gr no problem.
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  7. #7
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    Quote Originally Posted by Pommy View Post
    You've got it a bit backwards mate. The faster the twist, the heavier (longer) the bullets it will stabilise. The 1:8 twist is really fast - it'll have no problem at all stabilising 125gr (light, short) projectiles.

    Unless you plan on shooting subs, I'd get the 1:12. @flock has one for sale I think. 1:12 will stabilise everything supersonic up to 180gr no problem.
    Spoke to Flock but we couldn't quite get things to line up so now I have the choice of going for either option. Thanks for your input, I am not interested in playing around with sub sonic loads but 180gr plus might be an option to reach further out .

  8. #8
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    Whats your plan how far and what animals are you targeting?

    I went out to the range this morning for a quick shot before the wind got up to much. Was using my 16” 308win with a 1:11 twist, 168gr A-max first round hit on steel out to 770m. This combo smashes reds very well out to 440m. Could also do this the same with 178gr ELD-m.

    Only a couple of inches off centre at 773m 19 degrees downhill in 3m/s wind so 300m and 400m is easy.

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  9. #9
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    Quote Originally Posted by tikka View Post
    Whats your plan how far and what animals are you targeting?

    I went out to the range this morning for a quick shot before the wind got up to much. Was using my 16” 308win with a 1:11 twist, 168gr A-max first round hit on steel out to 770m. This combo smashes reds very well out to 440m. Could also do this the same with 178gr ELD-m.

    Only a couple of inches off centre at 773m 19 degrees downhill in 3m/s wind so 300m and 400m is easy.

    thats bloody good going!
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  10. #10
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    Quote Originally Posted by tikka View Post
    Whats your plan how far and what animals are you targeting?

    I went out to the range this morning for a quick shot before the wind got up to much. Was using my 16” 308win with a 1:11 twist, 168gr A-max first round hit on steel out to 770m. This combo smashes reds very well out to 440m. Could also do this the same with 178gr ELD-m.

    Only a couple of inches off centre at 773m 19 degrees downhill in 3m/s wind so 300m and 400m is easy.

    @tikka , that's awesome mate, I won't or intend to shoot over 450 and hopefully mostly under that.
    So the Golden question is if you could start from scratch would you go for the 1.8 or 1.12 twist ?

  11. #11
    Member Micky Duck's Avatar
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    1;12 because it wont be as hard on soft projectiles going fast..... speer is good and cheap.
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  12. #12
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    I would still go with the 16' 1:8 I bought for shooting suppressed bush hunting with the dog.
    But I also have a 23.5" 1:12
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    @viper
    For my style of hunting which is 80% stalking close on deer with the dog, high round count goat culling and preferably shooting heavy subs with a 300 blackout. The 308win is a stock standard tikka T3 chopped to 16” it has the factory 1:11 twist barrel and would rather have a 1:8 twist solely because I could run both Lehigh Defence subsonics and 168gr + heavy’s for longer range deer and goats across gully’s.

    Once the barrel is cooked will rebarrel to 1:8 twist, the other bonus of a factory 1:8 barrel is the resale is easier and more sort after now days if your not into it anymore.
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  14. #14
    Member viper's Avatar
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    Quote Originally Posted by tikka View Post
    @viper
    For my style of hunting which is 80% stalking close on deer with the dog, high round count goat culling and preferably shooting heavy subs with a 300 blackout. The 308win is a stock standard tikka T3 chopped to 16” it has the factory 1:11 twist barrel and would rather have a 1:8 twist solely because I could run both Lehigh Defence subsonics and 168gr + heavy’s for longer range deer and goats across gully’s.

    Once the barrel is cooked will rebarrel to 1:8 twist, the other bonus of a factory 1:8 barrel is the resale is easier and more sort after now days if your not into it anymore.
    @tikka , great answer mate, that's gone along way too helping me make a decision.

  15. #15
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    Go for the 1:12 which will handle 125 -150 grainers well. The heavier bullets are not needed where we are!
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