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Alpine Black Watch


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  • 5 Post By Cyclops
  • 1 Post By keneff
  • 1 Post By jakewire

Thread: Re-checking my zero

  1. #1
    Member
    Join Date
    Mar 2014
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    In the Mainland
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    Re-checking my zero

    I've shifted my scope back on my 17 MOA rail - as far back as it can go without blocking the bolt.

    That seems to have produced a 2 MOA change in zero point.

    So off the the 100 yard range to confirm the change ahead of a end of season shoot tomorrow.
    A cold blustery wind blowing across the range.

    Confirmed a +2 MOA change of zero.
    The 300 yard zero wiil be at +2 MOA until I adjust the scope. I can allow for that.

    Shot two groups - a 10 shot group on the right and a 6 shot group on the left.
    The right group is about 3/4 MOA wide by 1 MOA high, the left group about 3/4 MOA wide by 1/2 MOA high.

    Rifle: Barnard 308 action, 32" 1:10 True-Flite barrel.
    155gr Lapua Scenar projectile in Lapua Palma cases with 44.5 gr Varget.
    Federal Premium Match small rifle primers.

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    Shootm, Tahr, gadgetman and 2 others like this.

  2. #2
    Member keneff's Avatar
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    Aug 2015
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    I wouldn't be tooo disappointed with either of those groups
    Cyclops likes this.
    I used to have a handle on Life - but it broke.

  3. #3
    Caretaker jakewire's Avatar
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    I could live with that
    Cyclops likes this.
    Quis custodiet ipsos custodes?

  4. #4
    Member
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    Mar 2012
    Location
    Waikato
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    899
    Yes but you dont stay that good by living with it do you ?

    I would come up another 1/4 or 1/8 moa and that will give you an edge over a number of 10 shot strings. Keep a critical eye on your first half dozen competition shots anyway.

    It looks as if you were picking the wind ? A 308 would drift more than that on wind variations even at 100yd.

    What do you think is the cause of the 2 moa change ? Is the rail not exactly 17 moa all the way or is there a speck of dirt in the surfaces somewhere, switched ring components or something ? I guess you re wondering about that sort of thing . I once found my airgun shot 3 moa high wih torch clamped on top of the scope so perhaps its just differences in angular inertia due to moving a signiicant component of the hardware. Of course your body position will have changed too.

    It seems shifting the scope back gives you a good position. How does grouping compare to the previous set up ?


    However its good shooting and a great basis for next season.

  5. #5
    Member
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    Jul 2014
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    Paengaroa, Te Puke
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    I would be happy with that alright

 

 

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