1-9 twist 6.5 ??

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Weezer, Apr 19, 2011.

  1. Weezer

    Weezer Member

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    I have had good luck with 130gn with 1-9, and 130, 140's with 1-8.5. Do you think I could get by with 140 Bergers @ 3000fps and 4000ft altitude with 1-9 ?? Thanks for any input. Weezer
     
  2. rscott5028

    rscott5028 Well-Known Member

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    I don't know the length of those bullets. I use SMKs that measure 1.355" and I know they work well with 1:8" twist.

    You can run the numbers on JBM's website and see what they say. But, my guess is that you'll be ok.

    JBM Stability Calculator... JBM - Calculations - Stability

    -- richard
     

  3. CPGfan

    CPGfan Well-Known Member

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    What Catridge? If you were shooting them fast enough, then yes, you would be fine. If you were shooting them less than 2900ish I would say it would be a gamble. Just my .02
     
  4. Weezer

    Weezer Member

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    Thanks for the info. The caliber I had in mind is a 6.5xRoberts AI or 6.5-06 A Sq. AI as I have reamers for them. Weezer
     
  5. Oliveralan

    Oliveralan Well-Known Member

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    I shoot 140 VLDs at 3441fps from my 6.5mm Voodoo with 1-9twist at 300ft altitude with zero problems, very good performance actually!
     
  6. trebark

    trebark Well-Known Member

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    What do you lose by going with 1:8? You can shoot both 130 and 140 grain bullets with that rate of twist. Whereas it seems questionable to go 1:9 with the 140.
     
  7. benchracer

    benchracer Well-Known Member

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    I have a 6.5x55 with a 1:9 twist. It shoots Berger 140 VLD's very accurately whether they are loaded fast or slow. I have not chronoed my loads, but the Berger 140's have shot well even with starting loads (42.2g H4831), less than 1000ft. above sea level, @ 45*F.

    I say give the Bergers a shot.
     
  8. remingtonman_25_06

    remingtonman_25_06 Well-Known Member

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    My 264 Win Mag is a 1-9" and is stabilizing the 140g amax out to 625 yards.

    It says 1-7.5" on the bullet box...

    MV is 3000-3100fps, about 1000ft ASL, 40-50 degrees.