Ladder test, 7-08AI

Discussion in 'Reloading Forum (All Calibers)' started by Dave in WI, Jan 19, 2019.

  1. Dave in WI

    Dave in WI Runs with scissors

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    [​IMG]
    Ladder test on a 7-08AI I built. 700 action with Bartlein 3B 8.7 twist. Finished at 20" (I know, that's what owner wanted).
    Hornady brass with WLR primers.
    Berger 150 Classic Hunter at @2.737" COL just into lands.
    VVN550 powder. Shot at 300yds. Slight wind from right.
    1 42.0 2520
    2 42.5 2614
    3 43.0 2635
    4 43.5 2661
    5 44.0 2650
    6 44.5 2645
    7 45.0 2743 bolt started sticking a little
    8 45.5 2795
    9 46.0 2824

    Thoughts and opinions appreciated!
     
  2. SPJ

    SPJ Gold $$ Contributor

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    I'd probably load 4-5-6 one more time
     
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  3. Dave in WI

    Dave in WI Runs with scissors

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    Several of each and shot for groups?
     
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  4. SPJ

    SPJ Gold $$ Contributor

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    At this point maybe three of each
    Better yet, just take a day off
     

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  5. ChadCollins

    ChadCollins Silver $$ Contributor

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    2,3,4,5,6 all look like they are within an inch of vertical.
     
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  6. Evlshnngns

    Evlshnngns

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    6-7 was a 100 fps gain in .5 grains. I'll have to keep it to .3 jumps on similar capacity cartridges. Is that normal?
     
  7. abersfelderami

    abersfelderami

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    Between 4 and 5 only.
     
  8. AROKHUNTER

    AROKHUNTER Gold $$ Contributor

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  9. Zero333

    Zero333 Silver $$ Contributor

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    4-5-6 is my guess.

    Whenever I run a Ladder, I shoot it twice back to back.
    This way I can correlate the findings by proving the repeatability of the point of impact.
     
  10. mgunderson

    mgunderson sling shooter Gold $$ Contributor

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    2-6 all look reasonable. Not sure how many rounds are through the barrel and it might be changing yet. Assuming it is low round count.

    Three shot groups or a little seating depth work would be my next step. Both should provide more information.
     
  11. Coyotefurharvester

    Coyotefurharvester

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    With a factory barrel I would try a repeat of 4,5,6. But with that barrel and bullet I would load 10 of #5 shoot a 5 shot group, and then I shoot 5 single cold bore shots using the same target. My rifle the shots(cold bore) during a month. It's a good hunting rifle staying inside moa.
     
  12. seymour fish

    seymour fish

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    1) your incremental jumps are coarse. 2) you have decent vertical from 42.5 to 44.5 3) consider moving to 200 to take some of the vagaries of wind out of it, and run the ladder again with smaller increments. 4) likely to find the center of node across 0.4-0.6 gr 5) no ambient temp listed. The n550 is quite temp sensitive, thus caution at the upper end
     
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