338 Lapua barrel, 10 or 9.35 twist

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by montana_native, Nov 3, 2010.

  1. montana_native

    montana_native Well-Known Member

    Oct 4, 2008
    I am going to order a barrel soon and my gunsmith told me to investigate the 9.35 twist barrels to see if they offer any advantages over a 10 twist. He says he's used numerous 10 twist Lilja's with great results and only recently used any of the 9.35 stuff and doesn't have much data for them.

    Any advantage to the tighter twist with 300 gr Bergers?

  2. WAMBO

    WAMBO Well-Known Member

    Dec 22, 2001
    I don't have any concrete evidence but if it was me I'd go with the 9.35 twist over the 10 just for the added spin that might be required for a longer bullet.
    The 300 Berger is longer than the 300 Sierra which many people have used with great results with a 10 twist, I have a 9.4 twist on my Lapua and it shoots the Berger quite well.
    In my mind it would give me added confidence that the bullet will stabilize better way out there.
    Wayne aka WAMBO
  3. sinarms

    sinarms Well-Known Member

    Oct 24, 2010
    I have made a ton of edges all with a 1/10 and they love the 300 gr bergers and sierra bullets
  4. bigngreen

    bigngreen Well-Known Member

    Nov 24, 2008
    I ran into the same thing, I'm ordering two 338 barrels and for a 338 Norma the recommendation was a 9.3 and the 338 RUM it was 1-10. I didn't ask why I just tell the barrel guys what I'm doing and let them do their magic.
    I suspect that it may have to do more with extreme long range accuracy, well beyond normal LRH even.
  5. bullfrog

    bullfrog Well-Known Member

    Jul 27, 2010
    My barrel maker told me he recommended the faster twist to help stabilize the bullet when going subsonic. I don't have a clue if it helps (never shot on paper that far). Just passing along the info.