1 in 9 twist for 223

This is a discussion on 1 in 9 twist for 223 within the Rifles forums, part of the Sniping Related category; bushmaster states that their barrels with stated twists will stablize up to 75 grain bullets. ive heard mixed feelings on that and was wanting more ...

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  1. #1
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    1 in 9 twist for 223

    bushmaster states that their barrels with stated twists will stablize up to 75 grain bullets. ive heard mixed feelings on that and was wanting more opinions from people who know. any help is very much appriciated!

  2. #2
    Senior Member Psycho-82's Avatar
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    1/7" and 1/8" will do fine with that bullet, however 1/9" might push it, you might be able to get 69gr with 1/9", hell try it and let us know! :wink:
    Chris

    Disclaimer: The views expressed herein are the views of MYSELF and should not be taken as the views of the agency for whom I work for!

  3. #3
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    i think i might. ive been wanting a RRA cause they have 1 in 8 but i got offered a pretty good deal on a bushy varminter at a price even better than a dpms! might as well i guess.

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    I would be curious too. I have a 1-9 also and I would love to shoot 77's out of it.
    Mark
    R-700 Tactical .308
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  5. #5
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    ive been wanting one for awhile, maybe ill get this one. if anything else i can just get another upper for heavier grains.

  6. #6
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    I have shot 75 and 77 grainers, both .223 and 5.56 pressures, out of a 16" and 20" 1:9 barrel. I can admit this wasn't past 100 yards, but at 100, it was as accurate as both my 1:7 barrels, and I didn't see any signs of tumbling or key holes.

    Didn't have the opportunity to get the 75gr pills out past 100 yards with the 1:9 barrel, but the 1:7 has been awesome with them at 300 and 400 yards.

    The 1:9 also seemed to have an edge with M193, and 52 and 69 grain SMK's.

    Try the 75 and 77 grain bullets, and also try both .223 and 5.56 loads (if it's a 5.56 barrel). Barrel length and actual twist rate can have an effect, as well. If for some odd reason none of those work for ya, don't feel bad. The 68 and 69 grain match bullets, M855, 70gr TSX, 52gr A Max, etc. will still work in the 1:9 barrel.

    A little talk about twist rates and bullet selection found here...
    http://www.m4carbine.net/showthread.php?t=19881

  7. #7
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    thanks guys. from what i have heard, read and seen (watched guy's on youtube shooting 75's at 700 yards with a bushy varminter) i think i will get it. its such a good deal and it sounds like it'll do exactly what i want. thanks again!

  8. #8
    Senior Member billt's Avatar
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    I have a total 5 Bushmaster AR-15's, all equipped with 1 in 9 inch twist barrels. I also purchased 2 Colts. A 6920 L.E. Carbine and a 6940 Monolith. Both of these guns have 1 in 7 inch twist barrels. The 1 in 7 twist is simply not needed, and in 99% of the AR-15's out there you will gain nothing. A 1 in 9 inch twist will easily stabilize bullets up to and including 75 grains. Anything longer and you are going to run into OAL issues that will cause magazine fit along with rifle functioning problems.

    The 1 in 7 inch hoopla was started by a lot of the Colt worshippers who decided that the 1 in 7 inch barrel was "better". You have to take a lot of this stuff with a grain of salt simply because the bulk of it is started by that whole mall ninja crew over at ARFCOM. If one of their "Trainer Guru's" makes a comment, it automatically becomes gospel to the entire crowd there. A good example of what I'm talking about is that silly "chart" they have over there, they all come up with every time someone asks about a given brand of AR-15 rifle. They bow to that thing like it's some sort of God.

    As I said, I own several rifles with both twist rates, and for 99% of AR-15 owners involved in 99% of the shooting they do, it isn't going to matter one iota. I put all of the 1 in 9 inch criticism of the Bushmaster ACR into the same round can. Bill T.
    I don't "need" my AR-15 Assault Rifle any more than Rosa Parks "needed" to sit in the front of the bus.

  9. #9
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    Well said!

    And while I agree with what you said, the only thing I might add is that the faster twist rate may be useful stabilizing the heavier pills in a short barrel AR, where something like a 77gr SMK leaving a 10.3 or 11.5 inch barrel might not have the time to stabilize and is travelling much slower.

    Also, the DoD was testing 77gr FMJ loads a couple decades ago, and has been testing 87 and 100gr loads over the last few years, which may have warranted the faster twist. Infact, Black Hills was producing a 100gr load for them for a short time. I'm sure 600-1000 yard AR shooters might be able to tell a difference, too.

    So while I completely agree about the chart and trainer thing, and that the 1:7 barrel probably isn't needed for most of us, it did have a reason for being. But...that probably falls into that 1% of AR shooters category.

  10. #10
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    my 20 inch colt 1:9 won't stablize 77g SMK at all ... spits them all over the place. I have a colt 24 inch CR6724 that loves 77g SMK and will smack a prairie dog out to 400 with ease. I had a 20 inch heavy Savage Model 10 that liked the 77g SMKs also. Sometimes it works sometimes it doesn't. My 20 inch HBAR Colt is spot on money with 62g m855 though. Unless your trying to shoot past 500 yards and buck the wind you don't need bullets that heavy though. All depends on the application.

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