Angle Corrected Range - Up/Down Shooting

Discussion in 'Hunter (HFT) & Field Target (FT)' started by PeteM, Mar 24, 2011.

  1. PeteM

    PeteM New Member

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    I have now conducted some testing on this subject:
    (Angle Corrected Range - Up/Down Shooting)

    My findings thus far are as follows:

    1. up or down to an angle of 15 º no compensation or very little is required.
    2. up or down to an angle of 20 º approx. shot goes 5mm high
    3. up or down to an angle of 25 º shot goes 8mm high
    4. up or down to angle of 30 º shot goes 11mm high
    5. up or down to an angle of 35 º shot goes 15mm high

    A simple formula is used to work out the Angle Corrected Range
    Cosine(Degree of Angle) * Measured Range = Angle Corrected Range

    * = multiplied by

    I set up at a horizontal distance of 25 yards with an ASLI (Angle Slope Level Indicator) device
    manufactured by Horus Vision LLC, USA. (manual attached). This device has a scale with the degree of angle on one side & the cosine of the angle opposite it.

    So the ranges were:
    1. 0 º = 25 yards
    2. 15 º = 24.14yards
    3. 20 º = 23.49yards
    4. 25 º = 22.65yards
    5. 30 º = 21.65yards
    6. 35 º = 20.47yards

    I have attached an Excel calculator. This is a work in progress.
    I am writing the code for a web based app that I will eventually include on the Calculators Page of the SWEFTA Website

    The shot always goes high, only after 15 º, then by increments.

    From my experience very few Field Targets are set at an angle of more than 25 º & I would say the average is between 5 º to 20 º.

    I believe (from what I have read about this subject) that as the distance increases from the target the amount that the shot goes high by, increases.
    At the moment this hearsay for me, as I have yet to test this out on the range.

    Well I hope this is of interest, it has certainly been so for me.
     

    Attached Files:

  2. NJR 100

    NJR 100 Because I`m AWESIME !!

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    so if a target is 35 yards and about 40 degree, you would aim??
     
  3. PeteM

    PeteM New Member

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    dial in for 26.81yards (27yards)
     
    Last edited: Mar 26, 2011
  4. Mr P

    Mr P Active Member

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    LOW bottom inside kill struggling to work out 26.81 yards on my dialing but excellent work pete.
     
  5. maestro

    maestro European Champion 2018

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    What happens on ranges around the top of the trajectory?
    And on shorter ranges?!?
     
  6. chrispro97

    chrispro97 New Member

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    as shooting purley chase with targets high and low,if targets is 55yards i go towards the middle of the kill shooting down hill,shooting up i go for bottom of kill,but sometimes shooting down hill u get pellet lift on windy days where pellet is lifted because the wind hits ground and back up etc,nothing like giving it less yards pete:confused::confused:
     
  7. PeteM

    PeteM New Member

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    Haven't had a chance to test those circumstances yet :)
     
  8. chrisc

    chrisc Lucky git

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    I've also done some extensive testing in this area and found that 45 degrees and 35 yards was only a couple of mm tops.:confused:
     
  9. big_phil555

    big_phil555 New Member

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    I used excel to determine the rifleman's rule for differing ranges/angles

    You can ad this to the website if you wish

    ATB

    Phil
     

    Attached Files:

  10. JEV

    JEV Member

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    Interesting post I have down loaded the calculator for fun.
    However, if you consider a 55yd target about 11.25yd high, which is higher than the roof ridge of the average house, you only need to take a yard of your elevation. In practical terms targets are never even this steep unless the course setter has a cherry picker!

    If you put a target at the height of most ladders say 4 yards, out at 16 yards, according to this calculator you shoot it at 15.7 yards. Unlikely to cause a miss, unless you have a 6" high scope line!
     
    Last edited: Mar 24, 2011
  11. JEV

    JEV Member

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    The question is how many targets have you ever shot at 35 yards that are100 feet up a tree. I certainly wouldnt like to have to put it there or re-paint it!
     
  12. Conor

    Conor Never been banned from sales Staff Member

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    This is a 45yrd target being set out, angle was approx 40 degrees!:eek: Shot from below left on the grass.
     

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    Last edited: Mar 24, 2011
  13. JEV

    JEV Member

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    That means the target would be as high as a 12 storey block of flats, a brave man.
     
    Last edited: Mar 24, 2011
  14. Conor

    Conor Never been banned from sales Staff Member

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    Not brave...crazy:D
     
  15. chrispro97

    chrispro97 New Member

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    do you hav trees with targets on over 60 ft high and higher for 45 degrees at 35 yards,think more like 15 degrees matey
     
  16. NJR 100

    NJR 100 Because I`m AWESIME !!

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    Not trees, cliffs.

    I may have my angles wrong? will try Saturday?
     
  17. JEV

    JEV Member

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    It would be interesting to see what angle targets are actualy at. My guess is that few ar over 15 deg.
     
  18. JEV

    JEV Member

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    It would be interesting to see what angle targets are actualy at. My guess is that few ar over 15 deg.
     
  19. Charlts

    Charlts Getting dusty

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    Never shot a 15mm at the bottom of the valley at the new Emley Chris? Or Calpins infamous devils drop shot from the top of the railway line at Anston? Thought not.;)
     

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    Last edited: Mar 25, 2011
  20. RobF

    RobF Administrator Staff Member

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    Those going to euskadi might want to pay a close eye to this... it's the only place i've given consideration to buying an inclineonmeter
     

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