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  1. #1
    Expert throttletony's Avatar
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    best twist for .223 55 gr bullets??

    Hi all - any input on this: What's the recommended twist rate if I were shooting 55 gr FMJ practice rounds? Also some 55 gr v-max Hornadys for coyotes? (It seems like the old standard was 1/12, the new standard in AR's might be 1/9 ??)

  2. #2
    Marksman Osobuco's Avatar
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    Go here for a lot of info
    The AR15.com Ammo Oracle

    My Sig556 is 1:7 and shoots 223 55gr perfectly well/accurately at 50-100 yards. Have not tried it further.

    An excerpt:
    Opinions (Pro and Con):

    1:9 is best.
    Why? Flexibility. It doesn't seem to have any problems throwing M856 tracers around, unless it gets really cold, it wears better than 1:7 and it stabilizes more rounds than 1:12. Additionally, 1:9 rifles, even Mil-Spec chrome chambered and barreled, can attain 1.0-2.0 MOA out to 300+ meters.


    No, 1:7 and 1:8 are the best.
    Why? Accuracy. For heavier and longer rounds during competition shooting, 1:8 and 1:7 twists are the best for heavy 77-80 grain rounds that I use to shoot competitively at 500-1000 meters. Who needs to shoot tracers anyhow? More importantly, heavier rounds are showing very good results in terminal testing and are proving to be much better defensive rounds.

  3. #3
    Grandmaster cosermann's Avatar
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    Both rates you mention will stabilize 55 gr bullets. Depends on your purpose.

  4. #4
    Plinker
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    I currently have three .223's, one 1:14 and two 1:12, both of which stabilize 55 grainers just fine. 1:12 does fine up to and including Nosler 60 gr. It is my understanding that 1:9 and tighter twists were developed for long-for-caliber bullets; 69 grains and above. Regards JN

  5. #5
    Grandmaster U.S. Patriot's Avatar
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    Both my Bushmaster and my Savage have 1:9 twist barrels. They both sling 55 grain rounds accurately out to 100 yards. I have not had the oppurtunity to shoot at longer distances.

  6. #6
    Grandmaster sgreen3's Avatar
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    Give this a look over maybe it will help


    223 Rem + 223 AI Cartridge Guide
    A reporter interviewing a Marine Sniper asked, " What do you feel when you have to shoot a terrorist"? The Marine shrugged his shoulders and replied "Recoil"

  7. #7
    Expert throttletony's Avatar
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    Thanks for the great responses yall. I appreciate the info.

  8. #8
    Sharpshooter
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    I have both a 1/9 and 1/7 and they both shoot 55gr fine.

  9. #9
    Shooter
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    I am building a 1/12 twist now, I will let you know how it shoots in a few weeks.

  10. #10
    Expert Jeremy1066's Avatar
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    the heavier the bullet, the more twist you need to stabilize it. 1:9 twist seems to be the "norm" because it will do well with a wide range of bullet weights. 1:12 twist will probably do best with 62gr. and less, but might struggle with heavier bullets at longer ranges. My M&P15 has 1:9 twist

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