Ladder test at 300 yards 6.5x47, varget

Discussion in 'Big Stuff--7mm, 30 Cal, .338+' started by warbird2006, Feb 18, 2018.

  1. warbird2006

    warbird2006 Silver $$ Contributor

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    Hi guys, need a bit help. I did a ladder test 300 yards. Loaded 95 grain V-Max starting at 34.5 and going up .5 grain. One ladder up, second down and third one up. There was little bit wind during shooting the third ladder. What do you think the not is?
    Thanks
     

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  2. dmoran

    dmoran Donovan Moran Silver $$ Contributor

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    Personally, I like the overlap and vertical dispersion of your 8's and 9's. The 7's are scattering in and the 10's are just starting to scatter away, which aid in my assessment of 8/9. Vertically you have elements of 7/8/9/10 all over-lapping, with 9 yielding the best potential vertically !.!.!
    Donovan
     
    Last edited: Feb 18, 2018
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  3. Grimstod

    Grimstod Machinist, Designer, and Shooter.

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    9 looks wind sensitive though unless you had some nasty gusts when you shot those. 8 seams like a good load. I look for a rise and then drop in the groups back when I used this method. Now I just shoot groups.
     
  4. Bart B.

    Bart B.

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    I would ignore horizontal dispersion. Unless you can identify which ones were moved sideways by wind, bullet unbalance or your own variables in holding the rifle while the bullet goes through the barrel. Even then, one or two can cancel out another two or one.

    Pick a load in the center third around 9, then shoot 15 to 20 of them in one group. It may well be as good as another one in that middle third.
     
    Last edited: Feb 18, 2018
  5. warbird2006

    warbird2006 Silver $$ Contributor

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    These are the velocities

    Varget
    1 34.5 2773 2825
    2 35.0 2845 2842 2850
    3 35.5 2870 2862 2846
    4 36.0 2907 2787 2896
    5 36.5 2923 2964 2924
    6 37.0 2976 2993 2959
    7 37.5 2973 3020 2959
    8 38.0 3019 3056 3072
    9 38.5 3060 3039 3076
    10 39.0 3105 3120 3131
    11 39.5 3169 3167 3195
    12 40.0 3221 3221 3221
    13 40.5 3253 3255 -
    14 41.0 3317
    15 41.5 3336
     
  6. Zero333

    Zero333 Silver $$ Contributor

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    14-15
    Because I also consider windage. Barrels also vibrate horizontally, not only vertically (like some folks believe).


    Next time shoot the ladders on different targets. Will help to see things more clearly.

    kinda like this...

    IMAG1226.jpg
     
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  7. warbird2006

    warbird2006 Silver $$ Contributor

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    Zero 333, I actually did.
    Fab 17 -1.jpg Fab 17 -1.jpg Feb 17 -2.jpg Feb 17 -3.jpg Feb 17 -2.jpg Feb 17 -3.jpg
     
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  8. Zero333

    Zero333 Silver $$ Contributor

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    #14 & #15 look very consistent in all 3 ladders. That's where I would focus.

    Load somewhere between the 2 and do a seating depth test.
     
  9. Lone Hunter

    Lone Hunter Silver $$ Contributor

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    13 is consistent also
     
  10. 4xforfun

    4xforfun Gold $$ Contributor

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    ARE YOU TELLING ME THAT YOU GOT THIS BIG OF TARGET WITH THIS MUCH VERTICLE AT 300 YARDS?

    My ladders aren't that tall at 750.

    What am I missing?

    Tod
     
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  11. warbird2006

    warbird2006 Silver $$ Contributor

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    You tell me..
     
  12. MagnumManiac

    MagnumManiac

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    Actually barrels oscillate around their central axis. It is in an oval/oblong movement.
    It is believed that it gets higher in frequency as the bullet travels down the bore.

    In my own ladder tests I look for overlap and ignore any horizontal, as this can be attributed to wind or barrel harmonics equally.

    In my 22-250AI, I can change group size by altering seating depth alone, this is the only rifle I have ever had to do this so dramatically. Each bullet will tune at a different seating depth... weird huh?!

    Cheers.
     
  13. wedgy

    wedgy Gold $$ Contributor

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    Most of the velocities are all over the place like this;
    4) 36.0 2907 2787 2896
    What chrono,what powder scale, brass prep, etc.
    As stated those are ~1,000 yards size groups.
    You needs to get the ES down to at least 20fps
     
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  14. mikegaiz

    mikegaiz Stay frosty, my friend. Silver $$ Contributor

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    Please do not take this wrong, trying to help. I do not see anything worth using. I would try another kind of bullet or powder. Also sight in with a middle of load test load. 8,9,10 if you must use what you have. Sorry
     
  15. warbird2006

    warbird2006 Silver $$ Contributor

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    I am using new Lapua brass only chamfered, RCBS Chargemaster scale, Forester seating die. Chrono is LabRadar about 8' front of the barrel.
     
  16. jsthntn247

    jsthntn247

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    Try another bullet or another trigger puller
     
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