Anyone try heavy 308s in a 5-R barrel?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by mleeber, Sep 10, 2013.

  1. mleeber

    mleeber Member

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    I have a pet load for 308 which uses a 210gr SMK (don't need to argue about the 210 being too heavy for 308, it works well and the proof is in the groups I am getting). I am getting 1/2 MOA or better out of an 18" barrel in an LR-308. I am looking to add a Remington 700 to the collection and trying to decide between a 1 in 10 twist run of the mill Remy barrel (in an SPS Tactical AAC) and the 5-R 1 in 11.25. My concern is that the 210gr bullet will not stabilize in 11.25. Anyone have any experience with heavy bullets in a Remy 5-R barrel?

    Thanks!
     
  2. stanley52

    stanley52 Well-Known Member

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    Go to.... JBM - Calculations - Stability

    Just punch in your data and go. Make sure you click on the explanation of terms to know what their system of rating stability means. As a rule of thumb, match shooters choose the slowest twist that will stabilize their bullet, if that helps.
     

  3. MudRunner2005

    MudRunner2005 Well-Known Member

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    I have a 5R .308 Win and I have a pet load using 210 Berger VLD's. it shoots 1-hole cloverleafs.

    Left: Nosler 168 Custom Comp seated to SAAMI spec 2.810"
    Right: Berger 210 VLD load

    [​IMG]

    It loves the 168 load seated to SAAMI spec...That allowed me to shoot a 1.286" 24-shot group.

    [​IMG]
    [​IMG]
     
  4. mleeber

    mleeber Member

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    Thanks!!!! Nice little tool. I get a value of 1.290. My understanding is that the 5-R barrel is a hammer forged 5-grove polygonal rifled barrel, I wonder if this changes the calculation?
     
  5. mleeber

    mleeber Member

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    MudRunner, that is exactly what I was looking for! What is the BC on the Berger 210? The SMK is .645 at 1800 FPS and above and it is 1.483 long. I suspect that the Berger is similar. Thanks!

    P.s. I am limited in the DPMS on oal by the magazine but with the long Remy chambers my rounds should look much more like yours.
     
  6. stanley52

    stanley52 Well-Known Member

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    It shouldn't change it, at least on a registerable level. The only significant shifts you might see would be because of barometric pressure.
     
  7. mleeber

    mleeber Member

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    I ran the same data for a 10 twist and got 1.63. Very surprised that 1.25 makes that big a difference.
     
  8. MudRunner2005

    MudRunner2005 Well-Known Member

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    The Berger 210 VLD G1 BC is 0.631, and the G7 BC is 0.323
     
  9. Canadian Bushman

    Canadian Bushman Well-Known Member

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    Mudrunner, what kind of speed are you getting out of that berger?
     
  10. MudRunner2005

    MudRunner2005 Well-Known Member

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    Mind you, my 5R .308 is one of the not-as-common 24" models (which I prefer) for longer range stability. I am getting just at 2400 fps MV.
     
  11. mleeber

    mleeber Member

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    hmmmm....I am only getting 2054 with an 18" barrel but I am using a very fast powder (for 308). I am trying to figure out if I want to get a 24" gun and thread the barrel or a 20" with the barrel already threaded.
     
  12. Canadian Bushman

    Canadian Bushman Well-Known Member

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    That sounds like a nice 308 round
     
  13. MudRunner2005

    MudRunner2005 Well-Known Member

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    Yep, plus that load is stacking them in nearly 1 hole @ 100 yards, if the nut behind the trigger (me) does his part, of course. :D
     
  14. mleeber

    mleeber Member

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    What are you using for a powder?