338RUM Extreme Spread

Discussion in 'Reloading' started by chronic, Aug 17, 2015.

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  1. chronic

    chronic Well-Known Member

    Apr 9, 2010
    In my new RUM I am shooting 300g Bergers, with Retumbo.

    Some Data with 5 shot groups:
    CW ES SD ave fps
    88.8 25 11 2750
    89.0 26 10 2746
    89.2 26 10 2751

    This is a definite node in my charge weights graphs.

    My plan is to shoot some extreme distance, 1500 yds plus. Is this ES low enough for that kind of distance? Not a real good quantitative question! I know depends on target size.

    I am running out of options to try for ES reduction.

    Brass is Nosler Custom, all this data was collected with virgin brass. My next loads can be with annealed brass, I have some of each. I have not touched bullet seating depth or neck turning. (I hate neck turning)

    Any input would be great.

  2. J E Custom

    J E Custom Well-Known Member

    Jul 29, 2004

    Any time you can get SDs under 15 it is a good number. I like the single digits when I can get them
    anything under 7 is a great number and with good loads you can sometimes achieve SDs of 3 or 4.