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

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  #1  
Unread 09-10-2013, 07:36 PM
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Anyone try heavy 308s in a 5-R barrel?

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!
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  •   #2  
    Unread 09-10-2013, 09:30 PM
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    Re: Anyone try heavy 308s in a 5-R barrel?

    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.
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      #3  
    Unread 09-10-2013, 09:50 PM
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    Re: Anyone try heavy 308s in a 5-R barrel?

    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



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


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      #4  
    Unread 09-10-2013, 09:56 PM
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    Re: Anyone try heavy 308s in a 5-R barrel?

    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?
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      #5  
    Unread 09-10-2013, 10:00 PM
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    Re: Anyone try heavy 308s in a 5-R barrel?

    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.
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      #6  
    Unread 09-10-2013, 10:05 PM
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    Re: Anyone try heavy 308s in a 5-R barrel?

    Quote:
    Originally Posted by mleeber View Post
    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?
    It shouldn't change it, at least on a registerable level. The only significant shifts you might see would be because of barometric pressure.
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      #7  
    Unread 09-10-2013, 10:12 PM
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    Re: Anyone try heavy 308s in a 5-R barrel?

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