7 WSM - what twist for for 180gn Bergers?

Discussion in 'Long Range Hunting & Shooting' started by curiousaussie, Nov 11, 2009.

  1. curiousaussie

    curiousaussie Active Member

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    Dec 22, 2008
    G'day fellas,

    Just got my import paperwork through for a Shilen pre-fit 7 WSM barrel for my large shank Savage LRPV.

    My question is what twist rate - 1 in 9 or 1 in 8 to stabilise 180 gn Bergers.

    From what I've read so far 1 in 9 will handle the 162 A Max and 175 SMK, but I can't find enough info for the 180 Bergers.

    Any experience would be greatly appreciated.

    Cheers,

    Matt
     
  2. trebark

    trebark Well-Known Member

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  3. geargrinder

    geargrinder Well-Known Member

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    I went with the 8" on my Shilen pre-fit. Just making sure I'd be able to shoot the 180g VLD Bergers and 200g RBBT Wildcats.
     
  4. JeffVN

    JeffVN Well-Known Member

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    a 9 twist should work just fine.

    I have a 9 twist in both of my 7WSMs. They both shoot the 180 Bergers nicely.

    My brother has a 9 twist in his straight .284, which is considerably smaller in case capacity then the 7WSM, and it shoots teh 180 Bergers just fine, at least out to 1,600 yards - which is teh farthest he has tried to shoot it and them.

    JeffVN
     
  5. curiousaussie

    curiousaussie Active Member

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    Cheers fella's,

    Thanks for the replies.

    If a 284 Win can stabilise them with 1 in 9 then a 7 WSM will be fine in 9 twist.

    Matt
     
  6. blipelt

    blipelt Well-Known Member

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    I have a 1:8.6 from Brux for my 7wsm.


    Brent
     
  7. J E Custom

    J E Custom Well-Known Member

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    The 1 in 9 would be my first choice in the 7 WSM.

    If I was building a smaller cartridge in .284 (Like a 7/08) and intended to shoot 180 gr bullets
    then I would go to the 1 in 8 twist due to the slower velocity.

    Just my opinion

    J E CUSTOM