6.5/.284 bullet drop

Discussion in 'The Basics, Starting Out' started by trb0, Jul 28, 2005.

  1. trb0

    trb0 Well-Known Member

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    I just built a 6.5/284 and am wanting to shoot 500 yards for the first time.using a 139 gr. lapua at 2800-2850 in a 26 inch barrel.how many clicks on my 8.5x25x50mm leupold should it take in elevation to get me close at 500 yards. 1/8 inch clicks with a 2" high zero at 100? thanks timbo
     
  2. jb1000br

    jb1000br Well-Known Member

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    [ QUOTE ]
    I just built a 6.5/284 and am wanting to shoot 500 yards for the first time.using a 139 gr. lapua at 2800-2850 in a 26 inch barrel.how many clicks on my 8.5x25x50mm leupold should it take in elevation to get me close at 500 yards. 1/8 inch clicks with a 2" high zero at 100? thanks timbo

    [/ QUOTE ]

    I bet they are 1/4moa clicks /ubbthreads/images/graemlins/wink.gif

    6moa above your current 2"high at 100 ought to put you on paper at 500yds. that is 24 1/4moa and 48 1/8moa clicks.

    JB
     

  3. daveosok

    daveosok Guest

    Range Velocity Energy Drop
    (yards) (ft/sec) (ft-lbs) (inches)
    100 2741.7 2319.9 2
    125 2720.2 2283.6 2.2
    150 2698.7 2247.7 2
    175 2677.2 2212 1.6
    200 2655.7 2176.6 0.9
    225 2634.2 2141.6 -0.2
    250 2612.7 2106.8 -1.5
    275 2591.3 2072.4 -3.2
    300 2569.9 2038.3 -5.2
    325 2548.5 2004.4 -7.5
    350 2527.1 1970.9 -10.2
    375 2505.7 1937.8 -13.2
    400 2484.4 1904.9 -16.5
    425 2463.1 1872.3 -20.2
    450 2441.8 1840.1 -24.3
    475 2420.5 1808.2 -28.7
    500 2399.3 1776.6 -33.5<--inches 35.0745<---MOA

    1/8 moa scope clicks 1 click
    100 0.130875
    200 0.26175
    300 0.392625
    400 0.5235
    500 0.654375

    Number of clicks----------------53.6,


    100 1 moa 1.047
    200 1 moa 2.094
    300 1 moa 3.141
    400 1 moa 4.188
    500 1 moa 5.235

    This data was obtain using JBM
    and a B.C. of .585. I think it will get you close but as always nothing beats in field testing.
    I am sure someone else will come along and have different data. As far as the math goes I think its correct but pelase if it isnt then step in and correct me.
     
  4. trb0

    trb0 Well-Known Member

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    jb and dave, thanks for the info and your right they are 1/4 inch clicks thanks timbo
     
  5. D.P.

    D.P. Well-Known Member

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    Timbo
    If this helps I shoot 142 SMK's at 2925fps last week from a 100 yard zero I dialed on 8 MOA at 500 yards and 24.5 MOA at 1000.
     
  6. jb1000br

    jb1000br Well-Known Member

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    33.5" = 6.4MOA if i calc right...

    Rim -- my 142's at 2930+ take 7.5MOA to get from 100-500 at Mifflin.

    JB
     
  7. Guest

    Guest Guest

    Hey rimfire


    Is that with..."THE LOAD" How many grains ya pushin now? /ubbthreads/images/graemlins/wink.gif

    JOe
     
  8. D.P.

    D.P. Well-Known Member

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    JB
    same range, it could be your scope /ubbthreads/images/graemlins/grin.gif or mine /ubbthreads/images/graemlins/blush.gif
    Lab 50.0
     
  9. daveosok

    daveosok Guest

    Yep you are right, I mutiplyied 33.5 by 1.047 instead of dividing it by the moa at 500 yards. My mistake did it on an excel sheet and must have missed something. The 35 is an actual measurement in MOA but not one MOA at 500 yards which would be 5.235 and 6.5 or so moa. I aint gonna go back through all the math so thats an estimate but Jbs is closer. Yeah I was thinking that the scope would be a 1/4 moa. So be it.
    Dave
     
  10. Guest

    Guest Guest

    Rimfire...CCI BR primers now too /ubbthreads/images/graemlins/wink.gif

    BTW Takes me about 7.5 at the same range at miffen. Hmmmmmmm

    Joe
     
  11. trb0

    trb0 Well-Known Member

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    thanks for the help guys, i moved the elevation 32 clicks and shot at 560 yards for my first ever longrange group, 5 shots that measured 3.44 inches.not a big deal for some but i was pleased considering it came from a 12 pound model 70. thanks timbo