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Thread: 308 Win. twist rate?

  1. #1
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    308 Win. twist rate?

    A few years back I bought a Remington 700 SPS Varmint (26" 1 in 12 twist heavy barrel) in 308 Win. They had them on sale for $420 or $440 IIRC, so I had to buy it.

    I swapped out the cheap flimsy plastic stock with a Bell & Carlson M40 stock, bedded the action and put a Timney trigger in it. It has a Leupold Mk 4 4.5-14x50mm LR/T scope. It shoots Federal Gold Metal 168gr. BTHP absolutely awesome, sub MOA.

    I wanted to try the Federal Gold Metal 175gr. BTHP to see how well they shoot. I was wondering if the 1 in 12 twist would work with the heavier bullets? Doesn't the USMC M40A1/A3/A5 all have 1 in 12 twist and use 175gr. bullets?

    Thanks, NYH1.

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    Those twist rates are guidelines but not hard facts. I have a 1/9 Rem 700 5R that "shouldn't shoot 77 grain bullets, but it shoots 77, 80 grain bullets just fine. Buy a box and shoot and find out. I had a 308 Remmy 5R 11.25 twist and it shot 175's just fine.

    PB
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    Quote Originally Posted by Pappabear View Post
    Those twist rates are guidelines but not hard facts. I have a 1/9 Rem 700 5R that "shouldn't shoot 77 grain bullets, but it shoots 77, 80 grain bullets just fine. Buy a box and shoot and find out. I had a 308 Remmy 5R 11.25 twist and it shot 175's just fine.

    PB
    Thanks Pappabear.

    I too have a 700 5R 223 with 1 in 9. I actually set my 308 up just like my 223. It's also a good shooter. The heaviest I've tried in my 5R so far were Winchester Match 69gr. BTHP and Federal Gold Metal 69gr. BTHP. The Federal's shoot a little better so I just stuck with them.

    NYH1.

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    I have that same rifle with the same twist rate, barrel cut to 24" and braked. It shoots FGMM 175's fine, sub MOA.

  5. #5
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    I also have a Rem 5R with a 20" barrel and it handles the 175's fine.
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    Quote Originally Posted by maximus83 View Post
    I have that same rifle with the same twist rate, barrel cut to 24" and braked. It shoots FGMM 175's fine, sub MOA.
    Cool, good to know.

    Quote Originally Posted by Watrdawg View Post
    I also have a Rem 5R with a 20" barrel and it handles the 175's fine.
    My 223 is the 5R. My 308 is/was an SPS Varmint. Still good to know yours handle the 175's ok.

    Thanks, NYH1.

    Take nothing I say personal, remember....it's just the interweb!
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    What I haven't tried yet--and would like to this summer--is to see what the 1:12 factory barrel's upper limit is. For instance, I wonder if it'll struggle with a heavy load designed for long range, something in 180/185gr like the Berger Juggernaut.

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    Quote Originally Posted by NYH1 View Post
    Thanks Pappabear.

    I too have a 700 5R 223 with 1 in 9. I actually set my 308 up just like my 223. It's also a good shooter. The heaviest I've tried in my 5R so far were Winchester Match 69gr. BTHP and Federal Gold Metal 69gr. BTHP. The Federal's shoot a little better so I just stuck with them.

    NYH1.
    At one point in time I had the 5R in 223, 308 and 300WM all set up exactly the same. Same scope....Peeps talk about getting a .22LR for training for larger calibers. That 5R in 223 is the perfect trainer, zero recoil great practice weapon.

    PB
    Last edited by Pappabear; 06-14-19 at 11:55.
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  9. #9
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    My 12 twist REM 700.308 shoots 175s great. 20 inch barrel.... That 26 inch barrel is going to give you more velocity, and thus, more RPMS on the bullet.

    I used to think that was B.S. until I down loaded some long bullets to sub sonic in my gun.... they key holed. But at full velocity, they shot round holes.

    My 1/12 actually hates 168 smk at 1000 yards because the shape of the boat tail makes them suck in trans-sonic. I get a 12 yard spray zone of possible bullet impacts. But with 175s, I can get out to 1300 yards.
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    My Rem 5R 20" actually shoots Hornady 178 ELD-X factory better than Federal GM Match 175's.
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