0.008" Off versus Into the Lands --> 162 Amax

Discussion in 'Reloading' started by phorwath, Apr 18, 2010.

  1. phorwath

    phorwath Well-Known Member

    Messages:
    4,896
    Joined:
    Apr 4, 2005
    280 RCBS Improved 30-Degree Shoulder
    28" pencil-contoured Brux barrel on Rem M700 action
    Lapua 30-06 brass necked down & fireformed to chamber
    Federal 210M Primers
    Hodgdon H1000 Powder
    Hornady 162gr Amax

    295 Yards. Note that there was a bit of a gusting crosswind the first 175 yds down the range, reflected in horizontal spread.

    Never experienced such a dramatic difference in group size by changing seating depths. However this is a very light contoured 28" Brux barrel. I must have caught the harmonically balanced node with the 0.008" Off the lands load.

    The 4 green-outlined hits were with 62.2 grains H1000. Bullets jammed 0.008" Into the lands. Vertical spread equals 2 1/2".
    Avg MV=2943 fps
    ES= 19
    SD=8

    The 4 red-outlined hits were with 62.5 grains H1000. Bullets seated 0.008" Off the lands. Vertical spread equals 9/16".
    Avg MV=2948 fps
    ES=22
    SD=9

    These are the first two loads I've range-tested with the 162 gr Amax in this rifle. Both powder charges are about maximum pressure loads in my rifle. Load development with the 162gr Amax is complete. 0.008" Off the Lands!

    [​IMG]
     
    Last edited: Apr 24, 2010
  2. winmag

    winmag Well-Known Member

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    2,528
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    Dec 23, 2009
    Id go with ''red'':D. Very nice. Amazing results with only 3/10ths of a grain difference. Thanks for sharing.