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Thread: 338 and twist rate.

  1. #1
    Boolit Master andym79's Avatar
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    338 and twist rate.

    Hi guys I am thinking of having a 338 caliber rifle built.

    The longest bullet I want to shoot from it will be 1.3" 278 grain.

    I obviously want something that will stabilize that, preferably at around 1000fps, but also want to be able to shoot shorter bullets fast.

    Standard twist for the 338 is pretty much universally 1:10 because some jacketed bullets are as much as 1.8" long.

    I plan on only shooting cast!

    A 1:10 will limit my uper velocity to 1600fps (before accuracy heads south).

    1:10 twist is available to be easily, 1:12 easily but at cost a 1:14 only if I go to the hassle of importing from overseas.

    What sf should I be aimming for as a minimum? 1:12 at 1000 gives a SF 2.1 1:14 at the same SF 1.6.

    What twist should I go for, by that I mean which would be the most versatile for cast assuming that no bullets longer than 1.3" will ever be used?

  2. #2
    Boolit Master waco's Avatar
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    .338 what if I may ask?...
    The fear of the Lord is the beginning of knowledge: but fools despise wisdom and instruction.
    Proverbs 1:7

  3. #3
    Boolit Man
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    Sep 2007
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    Missouri
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    I have a 338-06. Rebore done by Jes reboring. It is 1-12. Shoots 180-225 jacketed sub moa. And 280 grain cast at 1200-1900 fps. Just great

  4. #4
    Boolit Master


    Larry Gibson's Avatar
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    "The longest bullet I want to shoot from it will be 1.3" 278 grain."

    A 14" twist will stabilize that bullet down to 900 fps.
    Larry Gibson

    “Deficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.”
    ― Nikola Tesla

  5. #5
    Boolit Master
    runfiverun's Avatar
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    I would probably opt for the 1-12 so you can run the whole gamut of cast and jacketed as the need arises.
    it's all an educated guess,,,, till the trigger is pulled.

    this opinion brought to you by mister low-tech solution..

  6. #6
    Boolit Master

    Loudenboomer's Avatar
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    I shoot a 1-9 twist in the .338 Lapua. I like it for the very long 300 gr. Berger bullet. My next .338 will be a .338 Federal with a 1-12 twist.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
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