338 1:10 twist

Discussion in 'Long Range Hunting & Shooting' started by trueblue, Feb 4, 2010.

  1. trueblue

    trueblue Well-Known Member

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    Will a 1:10 twist stabilize the 300gr smk and why is everyone using 1:9.3 twist?
     
  2. nddodd

    nddodd Well-Known Member

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    I've had two different edges w/10 twist barrels they both shot them good. I'd imagine everyones going to the faster twist for the wildcat bullets.


    -Nathan
     

  3. J E Custom

    J E Custom Well-Known Member

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    The 1 in 10 twist is the best all round twist for 200 gr to 300 grain bullets, But if you are
    only going to shoot 300 grain bullets then the 1 in 9.2 ,9.25 or 9.5 would 'probably" be
    better. (No proof of that just a hunch)>

    If you are planning to build a monster 338 (Excalibur or bigger the fast twist is not nessary).

    J E CUSTOM
     
  4. Topshot

    Topshot Well-Known Member

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    With a .338 Edge or similar I think you will have no problems out to 1500 yards with a 1 : 10 twist and the 300gn SMK.
     
  5. liltank

    liltank Well-Known Member

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    We use a 1:10 on a 338 Lapua using 300grn SMK's. No problems with stabilization so far. I know it is not a far shot, but I picked an empty shotgun shell off of a backstop this past weekend at 100yrds through the middle dead center with the described rifle and bullet above.

    Tank
     
  6. yama49

    yama49 Well-Known Member

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    The 338 edge shawn at DE built me is a 1-10 twist , shooting the 300smk, no problems to report.
     
  7. B23

    B23 Well-Known Member

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    This is only my opinion so take it with a grain of salt but I wonder how much of this 9.2, 9.3, 9.whatever stuff comes from some of these computer software programs that you input the information and it calculates "the perfect" twist rate.

    I am always open for something better but when you have guys like Shawn Carlock, Kirby Allen and Dan Lilja all saying 1-10, well, that's good enough for me.
     
  8. Broz

    Broz Well-Known Member

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    My 338 Lapua has a 10 twist lilja 27 1/2". All I shoot is 300 smk's. Yesterday I was tsesting a new scope for it. 8-32 x 56 NXS. I only shot 1 three shot group at 1008 yards. pic below. I would rather be lucky than good. But the two previous groups I shot at this same target were 3 shot groups that all 6 fell into 5" shot on two different days. So I say the 10 twist is fine with 300 SMK's. But if you would ever want to go with longer custom bullets a 9.5 would probably be better. I should also say I have shot a 36" gong at 2100 yards with this rifle and was pleased with the number of hits.

    Jeff gun)gun)

    [​IMG]
     
  9. bigngreen

    bigngreen Well-Known Member

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    I was wondering if the 9.3 twist would help going through the transonic and may lessen the effects you saw at 2285 yrds.
    A good share of the 338 Norma Mags I have read about, which seems to be designed around the 300SMK, run the 9.3 twist.
    Granted that this would be out of the norm for most shooting.
     
  10. sniperjwt

    sniperjwt Well-Known Member

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    I think the 1-10 is pretty much the standard for 338 and there is surly a reason for thatlightbulb it works:D
     
  11. MontanaRifleman

    MontanaRifleman Well-Known Member

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    The higher the BC the tighter the required twist will usually be. There will be some new high BC bullets coming along requiring a 9 twist or better, If you want to take advantage of them, then you'll need the appropriate twist. If I get a barrel chambered for 338 it will be a 9 twist if not an 8. I am waiting to see what happens in Las Vegas next month and see what Noel Carlson is offering.

    -Mark
     
  12. liltank

    liltank Well-Known Member

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    Who DAT? Never heard of him. Educate me please!

    Tank
     
  13. MontanaRifleman

    MontanaRifleman Well-Known Member

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  14. liltank

    liltank Well-Known Member

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