Twist Rate question

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Newbie, Sep 2, 2004.

  1. Newbie

    Newbie Active Member

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    Does anyone here know if a 7MM Remington Magun barrel with a 1 in 9.5 inch twist rate will stabilize 175 grain bullets? If not, does anyone here know what the heaviest bullet it will stabilize is?
     
  2. Fiftydriver

    Fiftydriver <strong>Official LRH Sponsor</strong>

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    Newbie 71,

    The 9.5 twist shoudl handle most 175 gr pills at the velocities the 7mm Rem Mag will drive them to.

    The flat base 175's will not be a problem at all. The long ones like the 175 gr Sierra SPBT may not be fully stabilized and would need a 9" twist.

    Most 9.5's I have seen stabilized all the conventional bullet weights in 7mm.

    Good Shooting!!

    Kirby Allen(50)
     
  3. LB

    LB Well-Known Member

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    Hey, you're not that much of a "newbie" if you are aware enough to ask a question like that. 175 grain is a common big game bullet in 7 Mag. I'd be surprised if most hunting bullets do not stabilize, depending on barrel length and muzzle velocity; unless you are thinking of an exotic bullet shape, or all copper.

    What is your mission? LB
     
  4. Newbie

    Newbie Active Member

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    Thanks guys.
     
  5. NotEnoughTriggerTime

    NotEnoughTriggerTime Active Member

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    I just asked Sierra the same question about their new 175 SMK (would the 175 SMK work in a 9-1/2 twist in a 7mm rem mag)

    The engineer's reply was at first no, it wasn't recommended for 9-1/2 twist @ 2900-3000 (roughly 7mm Rem Mag speed), they didn't think it would stabilize adequately. He recommened that I try the 168gr SMK instead.

    He then emailed me back a few days later, saying they did have some promising results with this combo, and that he would let me know what they found in a couple of weeks after further testing.
     
  6. marlow 243

    marlow 243 Well-Known Member

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    I may be wrong but i think if your barrel is rem stock it may be 9.25 twist check it out just a thought MARLOW