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223 1/7 or 1/9 twist? for AR15

TED GARTED GAR Member Posts: 389 ✭✭✭
edited April 2004 in Ask the Experts
I am looking for a barrel that will group consistently with the 69 grain match king. I currently have a 1/12 twist, and it only likes 55 grain. Would a 24 inch 1/7 twist or 16 inch 1/9 twist be better?
I would like some feedback from experienced shooters with actual results...I am going to invest, in a barrel, an would like the best downrange accuracy, which means tighter groups..Thanks...Ted
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Comments

  • PearywPearyw Member Posts: 3,699
    edited November -1
    I would go with the 1/7. I have 2 with 1/9 and they are good for the 55 and 62 gr. If you can get one, I would probably go with the 1/8, but that was not one of your choices.
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  • TED GARTED GAR Member Posts: 389 ✭✭✭
    edited November -1
    Thanks for the info, forgot about the 1/8 twist. I know a class III manufacturer that builds NAF short rifles, he uses the 1/8 10.5 inch
    barrels and says they put them all in a dime at 100 yards..
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  • pack rat633pack rat633 Member Posts: 1,052 ✭✭✭✭
    edited November -1
    I shot a Ruger Mini-14 with 1x7 twist, tried the 69 and 72 grain bullets, it didn't do anything spectacular with them. I'd say stay with the 1x9

    SEMPER FI MAC, SEMPER FI
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  • hatchettmanhatchettman Member Posts: 363 ✭✭✭
    edited November -1
    in the past, the rule of thumb has been: the less of twist, the heavier the bullet used. this lessens the amount of wooble and tightens the pattern. talk to an ar-15 builder or armourer!!!!
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  • TED GARTED GAR Member Posts: 389 ✭✭✭
    edited November -1
    Okay, I got some info from a fellow gunbroker seller. He gave me the stats, he emailed me a copy of the book. Just so anyone might want to know..THe 1/14 twist is for the hyper velocity 45-50 grain.
    The 1/12 is for the 55-60 grain, The 1/9 is for the 65, 69, 70 grain
    the 1/7.7 or 1/8 as we know it...is for the 75-80 grain, the heavy stuff..The 1/7 was built by the US military for the 62 grain, ss109 military round. BUT OVERALL THE 1/9 gives the best overall accuracy for a variety of bullet weights. It was adopted by the Match shooters association..Okay thanks Guys...For the help. I am going with the 1/9 hbar...
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