Twist for 7mm? 175smk and 160AB

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Coyboy, Mar 14, 2006.

  1. Coyboy

    Coyboy Well-Known Member

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    I'm ordering barrels for some projects, and was thinking a 1-9 twist should cover both of these bullets?

    Or is a 1-9 marginal with the 175 smk?

    Will be a 280AI 3 groove Pac-Nor #5.

    Thanks for any input, Jim.
     
  2. reed mosser

    reed mosser Well-Known Member

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    9 twist will work fine. Have had 4 7mm barrels with 9 twist and they all shot the 180 grain Bergers just fine. The 7mm sierra match king won't have any problems. My first pac-nor barrel i have recieved is a 3 groove super match and all I have to say is no copper fouling and great accuracy. They are a good barrel for the money.
     

  3. davewilson

    davewilson Well-Known Member

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    i agree, the 9 will be perfect.
     
  4. dimecovers3

    dimecovers3 Well-Known Member

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    What would you say on the twist if you also wanted to use a 140 grain often too?...still 9 or does anybody do a 9.5?
    Thanks
     
  5. davewilson

    davewilson Well-Known Member

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    a 9.5 would probably be OK but you're starting to push your luck with the 175's.a 10 will work with the 160's. if you want a special twist, talk to the barrel makers that cut the rifling.they can make almost any twist you want.
     
  6. HooterShooter

    HooterShooter Well-Known Member

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    Stick with a 9 twist. 140's are for velocity freaks!
    Heavy = Accurate.

    The 3500 & 3600 fps looks great on paper but won't look good on paper! (Targets that is!)

    Try the 176 cauterucio, you will love it.

    Do a search on that bullet, it has a .750 BC.

    I dont know if I'd use it on elk, but deer or smaller heck yea!

    Good Luck!
     
  7. Buffalobob

    Buffalobob Writers Guild

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    I have 7 wby with a 9.25 twist and the 160 & 162/168 match bullets are just a shade better than the 175 - not very much but just a tiny bit. I think with the 9.0 you will be just right.
     
  8. Coyboy

    Coyboy Well-Known Member

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    Thanks guys, good info, 1-9 she is. /ubbthreads/images/graemlins/grin.gif