Warm up your Ballistics Calculator!

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by bigngreen, Jan 26, 2010.

  1. bigngreen

    bigngreen Well-Known Member

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    I was thinking it would be fun and interesting to see what some of the different programs would do out there so here's it is.

    Sight-in data is a Berger 140gr bullet in .277 with a G7 BC of .248 and a G1 of 487 with a velocity of 3300fps. The scope is 2.2 in above bore and adjusts in 1/4 MOA zero's at 100yrds.

    Environmental data is Baro at 29.96 in/hg, 27 degrees F with 81% humidity at a elevation of 5612.

    Wind 5mph at 90degrees left to right, Azimuth is 334 degrees at 45 degrees Lat. Bullet is 1.245 long, right hand 1-11 twist.

    I would like to get drops for 750, 1015, 1600, and 2200 yrds. Make sure to say what program your using and what you think. I can shoot at all the ranges but 2200 on the range. I will shoot them when I get something loaded up worthy of the longer ranges. Through some spin drift and Coriolis in also for fun.
    This is for fun and something to think about. Lets have fun :D:D:D
     
    Last edited: Jan 27, 2010
  2. mudbug

    mudbug Well-Known Member

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    Here is what I get using Exbal and the G1 BC if I entered all the data right.

    This is using a 100 yard zero.

    750 yards 12.25 MOA 2.00 MOA for wind

    1016 yards 20.50 MOA 2.75 MOA for wind

    1600 yards 49.00 MOA 5.50 MOA for wind

    2200 yards 103.00 MOA 8.75 MOA for wind

    Mudbug
     

  3. Moman

    Moman Well-Known Member

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    Exbal with G1:

    750 yds: 12.0 MOA with 1.75 wind.
    1015 yds: 20.0 MOA with 2.75 wind.
    1600 yds: 47.5 MOA with 5.25 wind.
    2200 yds: 98.25 MOA with 8.5 wind.

    Still working on the others. Mind boggling, but what a great idea.
     
  4. Moman

    Moman Well-Known Member

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    Ballistic FTE:

    750 yds: 12.26 MOA with 1.99 wind.
    1015 yds: 20.50 MOA with 2.92 wind.
    1600 yds: 50.17 MOA with 5.68 wind.
    2200 yds: 105.39 MOA with 8.99 wind.


    Just got this program yesterday and may need to tweak something??
     
  5. Michael Eichele

    Michael Eichele Well-Known Member

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    Gonna need the bullet's overall length and a twist rate as well as direction of twist for accurate spin drift numbers. ;) Also, you say the wind is 5 MPH at 90 degrees. Which 90 degrees? Wind from 3:00 or from 9:00? This WILL make a difference with its relation to spin drift and the coriolus effect. At least for my personal calculators.
     
    Last edited: Jan 27, 2010
  6. bigngreen

    bigngreen Well-Known Member

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    Sorry about that, I figured someone would find something they needed.

    Wind is 90 degrees from the left to right, 9:00. Bullet is 1.245 OAL and the twist rate is 1-11 to the right.
     
  7. BryanLitz

    BryanLitz <b>Official LRH Sponsor</b>

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    Using the G7 BC and MOBALL.
    Solution includes coriolis and spin drift.

    Code:
    Range  	Elevation	Windage
    	correction	correction
    ----------------------------------
    750 	UP 12.1 MOA	Left 2.4 MOA
    1015	UP 20.4 MOA	Left 3.6 MOA
    1600	UP 49.4 MOA	Left 7.2 MOA
    2200	UP 107.1 MOA	Left 12.3 MOA
    
    -Bryan
     
  8. Mikecr

    Mikecr Well-Known Member

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    Using a modified Pejsa spreadsheet, which has no accounting for Rh, coriolis, or spindrift:
    750 = 12.3 -2.0
    1015= 20.7 -2.9
    1600= 49.3 -5.5
    2200= 107.7 -9.6
     
  9. Michael Eichele

    Michael Eichele Well-Known Member

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    Reloader's Archive accounting for ALL variables listed:

    750 = 12.25 MOA drop/2.25 MOA windage

    1015 = 20.5 MOA drop/3.25 MOA windage

    1600 = 49.0 MOA drop/6.5 MOA windage

    2200 = 108.0 MOA drop/12.25 MOA windage

    It is notable that at 1600 yards the velocity is nearing the transonic zone and at 2200 yards it is way under at 755 FPS.
     
  10. JRu

    JRu Well-Known Member

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    Our "regular cell phone solution", I can't give you the exact numbers because the software automatically rounds to nearest 1/4 MOA click:


    Code:
    Range  	Elevation	Windage
    	correction	correction
    ----------------------------------
    750 	UP 12.0 MOA	Left 2.25 MOA
    1015	UP 20.25 MOA	Left 3.5 MOA
    1600	UP 49.0 MOA	Left 7.25 MOA
    2200	UP 111.75 MOA	Left 14.25 MOA
    
    ( using Bryan's table format as a template for clarity )
     
  11. Eaglet

    Eaglet Well-Known Member

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    Includes Coriolis and Spin Drift
    using G7

    [​IMG]
     
    Last edited: Jan 28, 2010
  12. bigngreen

    bigngreen Well-Known Member

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    Using Loadbase 3.0 Mobile this is what I came up with. Using spin drift and coriolis in the G7.

    750 yrds 12.1 up and 2.5 left 2136.5 fps

    1015 yrds 20.3 up and 3.6 left 1785.6 fps

    1600 yrds 49.4 up and 7.2 left 1140.4 fps

    2200 yrds 108.0 up and 12.0 left 876.1 fps
     
  13. Eaglet

    Eaglet Well-Known Member

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    Bryan, we're pretty close for the first 1600 yards. We have 0.9 moa = 20.7" difference at 2200 yards. :)


    [​IMG]
     
  14. Eaglet

    Eaglet Well-Known Member

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    [​IMG]

    My goodness, you and I are real close!!! 4.6" difference on windage at 2200
    yards. Not bad. :D