what powder with 300 smk in your 338 lapua?

Discussion in 'Reloading' started by Tikkamike, Aug 10, 2010.

  1. Tikkamike

    Tikkamike Well-Known Member

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    My long awaited 338 Lapua is almost finished. Just wondering what powder those of you with 338 Lapuas pushing 300 SMK's are using and what kind of velocity you are getting with a 26" tube.
     
  2. royinidaho

    royinidaho Writers Guild

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    Not a Lapua but a RUM........Don't leave out H-50 BMG. She shot really good with Retumbo and H-1000 (lotsa folks use H-1000).

    50 BMG brought all things together.

    It doesn't seem to me to be 'that' much difference between the Lapua and the RUM except for the much much better quality of the Lapua brass....
     

  3. Broz

    Broz Well-Known Member

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    I use H-1000. I would start about 88 gr and work up to 90 durring barrel break in while watching for pressure signs. My SMK load was very happy at .062" off the lands with a CCI 250 primer. Once you get the barrel broke in and ready for groups work up in 1/2 gr increments looking for the sweet spot. I would think you will get 2750 somewhere around 91 gr. Unless you have a Broughton 5C barrel then you may see a bit more. I would not worry about th last few FPS and would consentrate on group size at 200 or 300 yards.

    Jeff
     
  4. tackdriver10

    tackdriver10 Well-Known Member

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    Mine really likes 90gr. of H-1000. Only getting 2742fps, but I'm at about 500ft above sea level too.
     
  5. BountyHunter

    BountyHunter Writers Guild

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    MRP2, H1000, Retumbo all work well.

    BH
     
  6. bigboy_30-378

    bigboy_30-378 Member

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    Now this is me and my rifle.

    31in barrel.
    338LM
    H-1000 @ 92grains and i'm getting 2850 average out of 20 rounds low of 2846 high of 2855.

    I'm getting average .226 3 shot groups and .300 5 shot groups

    I'm at 4000ft elevation.
    73*Temp 40%hum


    Tom
     
  7. jonthomps

    jonthomps Well-Known Member

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    Thanks for posting all the info fellas! I'm working up loads for my 338 LM with H-1000 too and it seems to be a very stable/consistent powder. I'm going to do some work with N-570 too, so we'll see how that goes . . .
     
  8. RockZ

    RockZ Well-Known Member

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    I have a 338 lapua imp and Retumbo is the winner. Very good results from100-1000 yds