GUN 1:7 vs 1:9

Discussion in 'On Topic' started by LancerV, Dec 1, 2008.

  1. LancerV

    LancerV Something Happened OT Supporter

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    What would the group difference between the two be with 77gr bullets? I can find 1:9 outta the ass but 1:7 not so much
     
  2. more off

    more off Moderator

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    length of barrel ? :hsughno:
     
  3. more off

    more off Moderator

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    i'm assuming you mean a .223 AR barrel like 16" ?
     
  4. kellyclan

    kellyclan She only loves you when she's drunk.

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    77gr is commonly recommended to be about the heaviest you'd want to put out of a 1/9 barrel, but that will be pushing the limit of that twist rate. If you plan on doing a lot over 65gr, go with the 1/7.
     
  5. LancerV

    LancerV Something Happened OT Supporter

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    Yea, its just a bitch to find a 1:7 I can find either the Noveske 13.7 with KX3 which is 500, or White Oak Stainless Steel only but I really want chrome moly as this upper isnt meant to be my precision upper
     
  6. I got my 1:7 from CMMG.
     
  7. LancerV

    LancerV Something Happened OT Supporter

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    How long was your wait?
     
  8. For a complete upper, about 3 weeks. That was back in March though.
     
  9. LancerV

    LancerV Something Happened OT Supporter

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    So ill prob get mine in about march than :o
     
  10. Willie J

    Willie J New Member

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    if ur shooting a lot of 55 gr then i would go 1:9. 1:7 will over stabilize 55gr and not be as accurate as if it were shot from a 1:9.
    As for the Chrome lined or chrome moly, moly is gonna be more accurate, whereas chrome lined will less accurate, but more durable/easier to clean

    my chrome moly with 1:9 will produce 1 to 1.5 MOA @ 100 with cheaper ammos
     
  11. footratfunkface

    footratfunkface New Member

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  12. footratfunkface

    footratfunkface New Member

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    Over stabilize? Please explain how that works.
     
  13. Painkiller

    Painkiller Sometimes remembering is better than forgetting

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    I feel that 1n9 is a compromise. 1n7 or go home.
     
  14. It's not a compromise, it's just better suited to a specific weight range of bullets. You have to decide what you want to shoot, then pick your barrel. If you want to varmint with 36gr bullets, then 1:7 and 1:9 are bad choices. There is no "best" twist, only the twist that works for your application.
     
  15. Painkiller

    Painkiller Sometimes remembering is better than forgetting

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    well most good ar's don't have 1n12 twist rates anyways with the exception of cmmg. Most .223 bolt guns are 1n12.
     
  16. Goat

    Goat That crack is really moreish

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    thank god I'm not the only one that noticed that.
     
  17. phrozenlikwid

    phrozenlikwid New Member

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    Are you saying that this doesn't occur at all, or just that it won't likely occur here?





    As far as the twist thing goes... depends. What bullets are you going to be shooting? Specifically, not just the weight. Weight itself doesn't mean dick to twist, length and velocity do (and of course, diameter). Twist isn't voodoo, nor is one rate inherintly "better" than the others. It's all about matching the bullets you plan on shooting. Most people like faster twists, because it gives them more flexibility to shoot todays longer (higher BC) bullets and reap downrange results.
     
    Last edited: Dec 1, 2008
  18. LancerV

    LancerV Something Happened OT Supporter

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  19. sprite

    sprite Active Member

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    Not sure if you're looking for complete uppers or stand-alone barrels but Bravo Company makes complete uppers with chrome-lined 1:7". Sign up for the "Email when its in stock" option and be ready to purchase within an hour of the email being sent.
     
  20. Willie J

    Willie J New Member

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    poor choice of words. spinning light projectiles( varmit rounds 36 gr, not as much 55 gr) too fast changes the way they're suppose to break up on impact. look around online, there's material comparing m16a1 with 1:12 shooting 55gr compared to 1:7 shooting 62 gr.... and so forth
     
  21. Soybomb

    Soybomb New Member

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    Bullet spin will not have any impact on what a bullet does when it hits its target, that would be a terminal ballistics myth. If you exceed the ideal twist rate by a large margin, by say putting light weight varmint rounds through a 1/7 twist upper though you might actually spin them so fast that they'll pull themselves apart in the air.
     
  22. footratfunkface

    footratfunkface New Member

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    Thank you for saving me the time it would've taken to type that.



    To the original poster, you might contact Noveske and see if the 16" barrels used in the N4 Light uppers are available separately. I don't think they are, but check. John does a lot of custom work, and may do something like sell one of those barrels alone. If it's in your price range. They do have some nice features if you NEED those features. Otherwise, they're probably a waste.

    Also, if they come back in stock anytime soon:

    http://global-tactical.com/operatorbarrelwithgastubeandrollpininstock.aspx
     
  23. spankaveli

    spankaveli OT Supporter

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    fuck yeah, i'll take 5. :bowdown:
     

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