338 norma mag

Discussion in 'Reloading' started by walter351, May 27, 2010.

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  1. walter351

    walter351 Well-Known Member

    Sep 16, 2008
    Just curious what loads guys are using for this round. My gun is getting close to being completed and I thought I would collect a little load data. Let me know.

    I should have pictures of my gun soon!
  2. trueblue

    trueblue Well-Known Member

    Feb 18, 2008
    Details on components, and who is building it ?
    DYODD, but I would try Retumbo in the 93gr range for the 300 SMK's.
    Another good powder would be Vit N570
  3. 6hangingc

    6hangingc Well-Known Member

    Oct 28, 2007
    Both Ward Brien and Jim Sloan (the designer of the cartridge) suggest using Ramshot Magnum. 91.0 - 93.5 range with 300 SMK
    That's where I will be starting as soon as I get all my parts together. Along with Retumbo and maybe H1000
  4. walter351

    walter351 Well-Known Member

    Sep 16, 2008
    My rifle is being built by Al Ewing. He is a local gunsmith and has held many records for shooting.

    700 action, spiral fluted bolt
    Jewell Trigger
    Bartlien Barrel, Sendero contour, 1-10 twist
    custom muzzle break - Al Designed the muzzle break.
    H-S precision stock
    Defensive edge check piece
    Tubbs recoil lug

    Nightforce 5.5-22 x 56mm
    Badger ordiance rings
    EGW 20 moa base

    I also have a manners stock but it is a little heavy. He has built other guns for me in the past and they shoot exceptionally well. He is also building a 338 norma at the same time so it will be nice to do load development with him.

    Thanks for the replies. I am very interested in the Ram Shot powder as I have never used this powder before. I have used the others and I will be trying the retumbo for sure. I also have a lot of h-1000 as that is what my 264 Win mag likes. Thanks again
    Last edited: May 31, 2010
  5. Autorotate

    Autorotate Well-Known Member

    Apr 2, 2007
    In the middle of load development...but have loaded several strings of H1000, Retumbo, and RSM at incremental charge weights.

    H1000 is a touch quick (pressure before case capacity and velocity potential is reached)....

    RSM is just about right on load density/pressure....

    Retumbo will require you to use compressed loads to obtain the velocity of RSM...

    Velocity wise, given equal pressures....H1000-slowest, Retumbo-next fastest, RSM-best velocities.

    This is out of 27" barrel; longer barrel might do better by Retumbo, but for now it looks like RSM has the most promise. From what I can see, if you just had to use H1000, it looks like you might need to run 35-50 fps slower than what RSM or Retumbo could get you.

    Looks like accuracy/pressure is going to come in around 2750 to 2800 fps for this 27" 10 twist Lilja.

    I'll be interested to hear of anyone's results of temperature testing with RSM.

    V570 looks like it would be interesting to try in this chambering.gun)
  6. Rimfire

    Rimfire Well-Known Member

    Jul 14, 2007
    RSM and R-22 are the two Sloan advised that will reach top FPS before pressure. I couldn't find any RSM yet so I've been shooting R-22 with great accuracy.