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Trajectory chart help ?

hdwrench
i am confused by remingtons charts . what i need to know is if i zero a 140 grain 280 caliber at 100 yards what will be the bullet drop at 200,300,400 and 500 ? lets use the accutip for example ....

here is there chart ...

Long-Range Trajectory
Cartridge Type Bullet 100 150 200 250 300 400 500

Remingtonr Expressr 140 1.5 1.4 zero -2.8 -7.0 -20.5 -42.0
Premierr AccuTipT 140 2.5 2.9 2.1 zero -3.4 -14.8 -33.0
Remingtonr Expressr 150 1.8 1.6 zero -3.1 -8.0 -23.6 -48.8
Remingtonr Expressr 165 2.0 1.8 zero -3.6 -9.1 -27.4 -57.8

why do they have different zero yards ?
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Comments

9 comments

Date Votes
  • HandLoad
    Because of their differing velocities, combined with their differing ballistic coefficients, they describe different arcs as they fly.

    The one with a longer yardage for Zero is the most perfect projectile - it loses velocity less quickly.

    That doesn't mean that it retains/delivers the most ft/pounds at your intended target range...
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  • HandLoad
    Sierra Bullets has a great ballistics program/sw that will calculate exactly what you want. I had it on my WIN98 cornfuzer, but this new Vista machine is not compatible.
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  • HandLoad
    You want me to go downstairs and run the calc for you ?
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  • hdwrench
    please do . i would like to see the drop if zero'd at 100 ....

    wrench
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  • HandLoad
    So, you need to give me the BC, Sectional Density, velocity you are shooting it, and so on...the program I use has compensation for altitude and humidity, temperature and Barometric pressure, IIRC...I will pick "Standard Conditions" for the values you don't supply.
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  • nononsense
    hdwrench,

    There shouldn't be any confusion, it's just that Remington uses 150 yards for the short range zero and 200 yards for the long range zero. They use the odd zero so that the general population doesn't have a direct comparison to other manufacturer's loads. You can compare between Remington loads but only approximate for other maker's loads. Without constructing a new table based on their interior ballistics, you have to extrapolate at the start or the proper method is to take that load and shoot it in at the ranges you desire to have accurate data.

    Here is some data for comparison with that load zeroed at 100 yards:

    Optimum trajectory information :
    Optimum sight-in range (X) = 260 Yds.
    with max. ordinate above LOS at range (M)= 149 Yds.
    and max. point blank range (P)= 304 Yds.
    Sight-in clicks, 1 click = 0.635 cm/100 yd. or 0.25 in/100 yd.
    Height of sight above bore axis = 5.0 cm or 1.969 inch
    Gun is zeroed-in at 100 yds,
    by sighting-in at level firing
    Range Velo Time of Energy Path Deflection Total Sight correction Target
    city flight to at crosswind drop for setting new lead
    LOS of 10.0 Mph zero range 33 fps
    ?Yards fps s ft.lbs. in. in. MOA in. Clicks MOA yds ?
    | 0 2999 0.0000 2796 -2.0 0.0
    0.0
    0.00
    | 50 2900 0.0507 2614 -0.5 0.1 0.22 0.5 +3.7 +0.89 0.55
    M 97 2809 0.1002 2452 0.0 0.6 0.55 1.9 0.0 0.00 1.10
    X 100 2803 0.1034 2442 0.0 0.6 0.57 2.0 0.0 0.00 1.13
    | 150 2708 0.1582 2280 -0.6 1.4 0.91 4.7 +1.7 +0.42 1.73
    | 200 2615 0.2147 2126 -2.5 2.6 1.23 8.5 +5.0 +1.19 2.35
    P 210 2597 0.2263 2097 -3.0 2.8 1.30 9.4 +5.7 +1.37 2.47
    | 250 2524 0.2730 1981 -5.5 4.0 1.54 13.6 +9.0 +2.14 2.99
    | 300 2435 0.3329 1843 -9.9 5.8 1.84 20.0 +13.3 +3.18 3.64
    | 350 2348 0.3955 1714 -15.8 8.0 2.18 27.9 +18.2 +4.33 4.33
    | 400 2262 0.4609 1591 -23.3 10.7 2.55 37.4 +23.4 +5.59 5.04
    | 450 2179 0.5288 1476 -32.6 13.8 2.94 48.6 +29.0 +6.93 5.78
    | 500 2097 0.5990 1367 -43.6 17.4 3.32 61.7 +35.0 +8.35 6.55
    M = Peak vs. L.O.S, X = Set Zero, P = Max. Point Blank Range
    Elevation above Angle of Site (0.0 deg.) = 0.0635 deg.

    I know, it doesn't line up perfectly but you can C&P this into a Word document and straighten it out.

    Best.


    Added:

    Well, I don't know where that other data came from but it wasn't what I needed to illustrate the answer to your question. I apologize!

    The corrected data has been substituted in the same area above.

    Best.
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  • HandLoad
    Well, there you go...and yep, I didn't make clear that you or they can pick any arbitrary point for zero.

    Regards,

    Big Ugly Guy (HandLoad
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  • JustC
    JBM is free,..and a great tool.

    http://www.eskimo.com/~jbm/ballistics/traj/traj.html
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  • hdwrench
    ok , i got it now . thanks for the jbm chart ,that will answer many questions in the future also .

    thanks to all,wrench .
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