Rifle Twist

Discussion in 'AR-15 Discussion' started by jesseingall, Jan 15, 2011.

  1. jesseingall

    jesseingall New Member

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    I am about to buy a barrel for my AR build and I just want to figure out what twist i want. I've found barrels in 1:7 and 1:9 but im just not sure which one i want. I don't know what ammo ill be shooting but ill use whatever is at the local gun store that will work with the barrel twist i have (bullet weight). im going to use this AR to shoot targets and to shoot woodchucks, fox, coyotes, etc. i dont expect to be shooting over 200 yards but it'd be nice to have a barrel that i could shoot that far with. i plan on getting a scope for the AR and some iron sights. could anyone shed some light on this issue? thank you!
     
  2. mjkeat

    mjkeat New Member

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    1:7 so you can shoot the heavy stuff plus its the most readily available.
     

  3. jesseingall

    jesseingall New Member

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    alright thats what i was thinking also. thanks for the advice.
     
  4. mjkeat

    mjkeat New Member

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    Not a problem.
     
  5. Gloves

    Gloves New Member

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    Q: why would somone want 1:9 twist?
     
  6. Squirrel_Slayer

    Squirrel_Slayer New Member

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    For shooting lighter bullets like 55 grains for shooting varmints.
     
  7. Gloves

    Gloves New Member

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    1 in 7" twist is military standard
    they shoot 55 or 62grain?

    1 in 8" is better for heaver grain (62)?
     
  8. Squirrel_Slayer

    Squirrel_Slayer New Member

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    My rifle has a 1:8 twist Wilson Combat barrel on it, and I cannot shoot anything lighter than a 69gr. bullet. It won't group worth a darnn. As for a 1:7 twist barrel, I would think that you would want an even heavier bullet. I know that alot of the guys shooting the AR for really long ranges, pushing the distance limit of the .223 round, they are using 75gr. and 80gr. bullets in 1:7 twist barrels.
     
  9. Gatekeeper

    Gatekeeper New Member

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    Its really the length of the bullet that determines what twist you need.
    Military 62gr ss109 bullets are very long for their weight due to the steel penetrator. IIRC they are actually about the length of a 69gr BTHP.

    I use a 9 twist in a couple 223's and they shoot well with the 50 -69grain bullets I use for competition and varmint hunting.
     
  10. mjkeat

    mjkeat New Member

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    Ive only used 1:7 to date and mostly shoot 55gr-62gr ammunition. So far so good. However, I usually practice at more practical ranges. 25-100 yards. I would be interested in seeing how a 1:8 twist barrel handled the gamut of available ammunition.
     
  11. Squirrel_Slayer

    Squirrel_Slayer New Member

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    The barrel on my rifle has been so picky so far, that once I found my recipe for powder, powder charge, and bullet brand/weight, I will not differ one bit. Not unless something becomes unavailable. Which I doubt will ever happen. All of the stuff I use is pretty common.