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Thread: Help

  1. #1
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    Help

    the ppu ammo i use has a 12.5" drop at 300yds zeroed at 150 can someoneplease tell me what it would be at 500 ? (need the info for Eliminator scope)

    Many thanks S

  2. #2
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    Quote Originally Posted by steyrman View Post
    the ppu ammo i use has a 12.5" drop at 300yds zeroed at 150 can someoneplease tell me what it would be at 500 ? (need the info for Eliminator scope)

    Many thanks S
    What PPU ammunition might that be? Without knowing that we can't help you.

    We need -

    1. Calibre and bullet weight.

    2. Muzzle velocity.

    3. BC of bullet if possible.

    tac
    Last edited by tacfoley; 06-07-2015 at 06:43 PM.

  3. #3
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    Don't forget the scope height too
    And then an ice hockey game broke out: http://www.youtube.com/watch?v=G0woZ...layer_embedded
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  4. #4
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    Quote Originally Posted by steyrman View Post
    the ppu ammo i use has a 12.5" drop at 300yds zeroed at 150 can someoneplease tell me what it would be at 500 ? (need the info for Eliminator scope)

    Many thanks S
    do you have the opportunity to shoot at 500? is there a marker? if so the easiest way is to go to the range put on an average drop for 500 and take a shot, the marker will show where the shot hits (if you are correct in your 300 zero then it should hit on target frame...somewhere ) adjust for fall of shot and keep note of the adjustments, a ballistic chart is only going to get you into the vicinity unless you have all the variables tied down.

    try 57" as a starter (based on 168grn PPU BTHP at 2700fps)
    You Cannot Reason People Out of Something They Were Not Reasoned Into
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  5. #5
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    ...waiting.....

    tac

  6. #6
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    Sorry for the delay lads
    .243
    90g
    b.c. 0.333
    m.v. at 100yds 3100fps 300yds 2285 fps
    scope height 6cm centre of barrel to centre of scope

  7. #7
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    Quote Originally Posted by steyrman View Post
    Sorry for the delay lads
    .243
    90g
    b.c. 0.333
    m.v. at 100yds 3100fps 300yds 2285 fps
    scope height 6cm centre of barrel to centre of scope
    your original drop of 12.5" at 300 from a 150 zero looks all wrong are you sure of that? (I am assuming that the drop is the adjustment from 150 to 300 )
    or play with this
    You Cannot Reason People Out of Something They Were Not Reasoned Into
    "Politicians like to panic, they need activity. It is their substitute for achievement" Sir Humphry Appleby

  8. #8
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    Your figures do not seem right.

    Zeroed at 100 yards I would expect a drop of only about 6 inches at 300 yards.

  9. #9
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    Hi where did you get your velocity fps from are they book or actual measured. tony
    Howa Varmint 204 Ruger,243win,308win,Rem PSS 308win, Steyr 22/250

  10. #10
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    All of the ppu ammo site ?

  11. #11
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    In my opinion the printed fps are meaningless other than in the test rifle at prof house. A chrono is required to get fps from your rifle then calculations can be done. Atb Tony
    Howa Varmint 204 Ruger,243win,308win,Rem PSS 308win, Steyr 22/250

  12. #12
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    From the Prvi Partizan website.

    243 Winchester SP 5.80 g (90 gr)

    0 50 100 150 200 250 300
    Velocity [m/s] 945 889 835 783 734 686 640
    Energy [J] 2603 2304 2033 1789 1569 1371 1192
    Trajectory [cm] -5 - 0.1 1.7 0 -5.6 -15.9 -31.5

    As you can see, the 90gr bullet only drops a bit over 12" at 330 yards, as you noted. The bullet is NOT zero'ed at 150m, but that is the point blank impact point where the bullet first crosses the line of sight in its trajectory from the muzzle. You'll need to use the link posted by kennyc to do the real math.

    tac
    Last edited by tacfoley; 08-07-2015 at 10:27 AM.

  13. #13
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    Here y'are - http://www.jbmballistics.com/cgi-bin...j_simp-5.1.cgi

    Calculated Table
    Range Drop Drop Windage Windage Velocity Mach Energy Time Lead Lead
    (yd) (in) (MOA) (in) (MOA) (ft/s) (none) (ft•lbs) (s) (in) (MOA)
    0 -1.5 *** 0.0 *** 3118.5 2.793 1943.1 0.000 0.0 ***
    100 -0.0 -0.0 0.9 0.8 2823.4 2.529 1592.8 0.101 17.8 17.0
    200 -2.9 -1.4 3.6 1.7 2547.1 2.281 1296.3 0.213 37.5 17.9
    300 -11.1 -3.5 8.6 2.7 2287.2 2.049 1045.3 0.337 59.4 18.9
    400 -26.1 -6.2 16.1 3.8 2042.7 1.830 833.7 0.476 83.8 20.0
    500 -49.4 -9.4 26.6 5.1 1814.3 1.625 657.7 0.632 111.2 21.2
    600 -83.3 -13.3 40.6 6.5 1604.5 1.437 514.4 0.808 142.2 22.6
    700 -130.8 -17.8 58.7 8.0 1417.3 1.270 401.4 1.007 177.2 24.2
    800 -195.7 -23.4 81.4 9.7 1258.1 1.127 316.3 1.232 216.8 25.9
    900 -282.5 -30.0 108.8 11.5 1133.2 1.015 256.6 1.484 261.2 27.7
    1000 -396.5 -37.9 140.5 13.4 1043.4 0.935 217.5 1.760 309.8 29.6
    08/07/15 04:23,
    JBM/jbmtraj_simp-5.1.cgi

    I'd shoot it for ya', too, if I wasn't on my way to Canada.

    tac

  14. #14
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    Thank for the replies lads (enjoy Canada Tac) and thanks again

    Are drops are in c.m.'s

  15. #15
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    Quote Originally Posted by steyrman View Post
    Thank for the replies lads (enjoy Canada Tac) and thanks again

    Are drops are in c.m.'s
    Thanks, I always do - it's going home for me.

    On the table above, everything is in imperial measurements. Being Spamish, they don't 'do' metric, or 'machinations of Satan' as it is known there.

    tac

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