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A bit of load testing .308 win

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  #8  
Unread 02-23-2010, 08:52 PM
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Re: A bit of load testing .308 win

Looks like your at the lower end of OCW for the 155 MK........the upper end should be close to 47.0 grains of Varget.

I noticed Varget prefers CCI Br2 primers. I use WW brass.

Good choice of Powder for the 308 Win.

Don't forget IMR 4895 another outstanding powder with 155 gr in 308 win.

If your using WW brass I suggest around 47.0 with Varget using 150/155gr in the 308 Win.

Last edited by alaska; 03-08-2010 at 06:38 PM.
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  •   #9  
    Unread 03-07-2010, 02:22 PM
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    Re: A bit of load testing .308 win

    Just an update...

    I had the chance to crono some loads today..>>

    46 grns Varget/155 Amax was producing an Av velocity of 2870fps from virgin Lapua brass/BR2 primers/26" tube.

    The same load with 155 Scenars was 2896fps.......155.5 Berger VLD was 2838fps

    Of all the loads i shot today 155 Amax are still the best and producing bughole groups...followed a close second were the Berger 155.5`s...

    I am hoping this load will become more consistant with a lower ES ( 60fps today )when I reload the once fired brass.

    I may switch back to the Federal GM match primers ..

    Any body else find high ES in there velocity spread with virgin brass ?
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      #10  
    Unread 03-07-2010, 11:10 PM
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    Re: A bit of load testing .308 win

    There's a sticky at the top of the reloading forum (this one) that has links to two Excel spreadsheets that I built. One of them will let you input 10 velocity data points and it will calculate Low, High, Average, ES, Energy, and SD for the string.

    For instance- using the velocities from your first group-

    Low = 2,705
    High = 2,758
    Average = 2,723
    ES = 53
    Energy = 2,767
    SD = 15.54

    Quote:
    Originally Posted by Varmartin View Post
    2.810 is 0.110` from the lands, brass is 2x fired Lapua


    Failed to getthe SD from the crono before it was packed away ,but did write down the velocities as i went ...

    SAAMI load 2.810 to bullet tip
    2721
    2709
    2737
    2716
    2720
    2712
    2730
    2722
    2705
    2758

    0.015 off the lands @ 2.280 to the ogive

    2723
    2738
    2742
    2717
    2766
    2717
    2725
    2749
    2752
    2738
    2775
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      #11  
    Unread 03-08-2010, 06:42 PM
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    47.0 Varget and 308 Win

    I suggest 47.0 of Vaget using 155gr and WW brass.......with Varget I have had best results with CCI br2 primers.

    Lapua is excellent brass but WW brass I beleve has more capacity.
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      #12  
    Unread 03-09-2010, 02:07 AM
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    Re: A bit of load testing .308 win

    Thanks for the replies fellas, I willreport back when I have loaded another batch. ;)
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      #13  
    Unread 03-09-2010, 06:53 AM
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    Re: A bit of load testing .308 win

    ive found 45.6gr AR2206H (H4895) = 2950fps and very tight 1 hole groups using 155gr VLDs...

    ES is a tad high @ 30fps, but im still tweakin it...
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      #14  
    Unread 03-09-2010, 07:20 PM
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    Re: A bit of load testing .308 win

    In the 308 Win for years back in the 80's and 90's Palma Match IMR 4895 was the powder to beat. The new then Reloader 15 was a contender....

    Still a excellent powder for the 308 win

    1992 Palma records - IMR4895 was the powder of choice for most folks. Charge weights varied from
    44.3 to 45 grains with the 155 MK. Some folks threw charges direct from measures; others
    weighed every charge to a +/- .05-gr. spread. Interestingly enough, the
    powder lots had varying degrees of fouling. That's not surprising as IMR4895
    is one of the `dirtier' powders on the market. Most folks didn't clean their
    barrels during the day on the range. Others drybrushed after each, or every
    other 15- or 20-shot stage. Many of the top scores were shot using IMR4895.

    A good load is IMR 4895 @ 43.6 with 168 Sierra MK and Fed 210M in FC brass. This will duplicate the Federal Gold Medal Match load @ 2600 FPS.

    Last edited by alaska; 03-09-2010 at 07:30 PM.
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