Best powder for 338 Lapua AI and 6mm AI

Discussion in 'Reloading' started by Tyler Kemp, Sep 9, 2009.

  1. Tyler Kemp

    Tyler Kemp SPONSOR

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    I think the cases should use a pretty similar burn rate powder, I will be using 300's in the 338 and 115's in the 6mm.

    I would rather buy powder in bulk and save a bunch of money, than use a different powder for each just to gain 25 fps.

    So, in conclusion, what powder should work optimally in both cases with heavy bullet weights?
     

  2. Tyler Kemp

    Tyler Kemp SPONSOR

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    According to Quickload, IMR 7828 should give 3350 fps from 115's in the 6mm, (seems fast) and US869 will give 2900 fps in the 338. (seems slow)

    It seems like the best choices would be:

    H1000
    Retumbo
    Reloder 25
    US869


    Or maybe another?
     

  3. jmden

    jmden Well-Known Member

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    What does QL say for the 338LAI, 300g SMK and H-50BMG?
     
  4. Tyler Kemp

    Tyler Kemp SPONSOR

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    It's a friend who has Quickload. Probably very slightly less since H50 BMG is next faster in burn rate according to my charts.
     
  5. BountyHunter

    BountyHunter Writers Guild

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    Think you will find that MRP and MRP2 work extremely well along with what has been mentioned and gives very good fps and consistent. Graf and Black hills has it.

    BH
     
  6. trueblue

    trueblue Well-Known Member

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    Tyler,
    I would start out with Retumbo. I have used it in 338 EDGE, 7STW, all the way down to my 25-06. It is a great performer in whatever I shoot it in, and seems to give me the best velocities as well.