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223 bullets

moonshine
will an AR 15 with a 1 in 9 twist handle a 62 gr, or should i stick to a 55 gr.
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4 comments

Date Votes
  • Nwcid
    Should shoot both just fine. That is what it was made for.
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  • beantownshootah
    1-in-9 is great for 62 grain bullets, or for 55s.

    In fact, it should work fine with anything in the range of 45-75 grains, though bullets at either end of the weight range may give you issues depending on the exact load.
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  • BaseJumper
    Copied from another website that claims to quote someone from Olympic arms:

    quote:Twist Rate for Barrel?

    What is the right twist rate for an AR15/M16 barrel? The below is from Corey Sattler of Olympic Arms. It will give you a good idea of what you should look at.

    * 1x7
    Technically too tight of a twist for any .224 bullet widely available, including the 80 grain. Manufactured originally to stabilize SS109 and/or tracer ammo, but further military testing has shown other twists to be superior. Some of the very heavy custom stuff (87 grain?) may work well, but why?
    * 1x8
    Great twist for 69-80 grain bullets. Sierra once informed me that the perfect twist for their 80gr was 1x8.2xxxxx (blah blah blah big long engineers explanation followed).
    * 1x9
    Good all around twist ratio. Best suited for 52-69 grain, but either end of the envelope will be questionable.
    * 1x10
    Practically the same as 1x9, but favors the lighter side a little more.
    * 1x12
    Great for the 40-52 grain bullets. Most often found on bolt action rifles as their primary use is varminting. All right for the 55 grain, but not the best.
    * 1x14
    If you want to under stabilize the .224 bullet, use this twist. Useless except for tumbling effect it causes upon bullet impact. IMHO, better to shoot straight with a good HP bullet as your chances to hit are better and damage will most likely be greater also.
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  • quickmajik
    1x12"
    is great if you want dramatic shallow wound bullet up set. I'd recomend this one above most others for personal defense carbines. it only has a 350yard range before the bullet distabilzes, but with 45 grain crimped hollow points and 55 grain FMJs it is truely devistating.

    1x9"
    stabilizes the bullet and it just tumbles twice and fragmnets. Its great for stabilizing the 55 grain bullet to the end of is trajectory so range is extended. but it really reduces the 5.56x45s terminal performance.
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