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what powder with 300 smk in your 338 lapua?

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  #1  
Unread 08-10-2010, 11:42 PM
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what powder with 300 smk in your 338 lapua?

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.
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" Real elk guns start with the number 3 or bigger and blow two holes, one in and one out." - My Dad
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  •   #2  
    Unread 08-11-2010, 12:53 AM
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    Re: what powder with 300 smk in your 338 lapua?

    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....
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      #3  
    Unread 08-11-2010, 08:26 AM
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    Re: what powder with 300 smk in your 338 lapua?

    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
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      #4  
    Unread 08-11-2010, 08:36 AM
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    Re: what powder with 300 smk in your 338 lapua?

    Mine really likes 90gr. of H-1000. Only getting 2742fps, but I'm at about 500ft above sea level too.
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      #5  
    Unread 08-11-2010, 08:47 AM
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    Re: what powder with 300 smk in your 338 lapua?

    MRP2, H1000, Retumbo all work well.

    BH
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      #6  
    Unread 08-11-2010, 10:23 AM
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    Re: what powder with 300 smk in your 338 lapua?

    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
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      #7  
    Unread 08-11-2010, 10:52 PM
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    Re: what powder with 300 smk in your 338 lapua?

    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 . . .
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