600 Yards

Discussion in 'Long Range Hunting & Shooting' started by HOGGHEAD, Oct 8, 2007.

  1. HOGGHEAD

    HOGGHEAD Well-Known Member

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    I have got my 300 WSM shooting great at 500 yards. I have her shooting 3-4 inch five shot groups at 500. I determined the actual velocity is at 3250 fps with the Sierra 155 grain Palma bullet. I add 2 1/2 minutes from 400 yards to 500 yards. The BC on the bullet is suppose to be .450. The ballistic calculator I have been using only gives zeroes out to 500 yards. I am now ready to shoot 600 yards(next step). How many minutes do I need to be dead on at 600 yards. By minutes I mean how high do I need to be at 100 yards so that I am dead on at 600. I am using 100 yards for my reference, but I am leaving my rifle zeroed at 400 yards. I hope my question is not too confusing?? Thanks, Tom.

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  2. AJ Peacock

    AJ Peacock Well-Known Member

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    Here is what Exbal gives for that combination. I used sea level for elevation.
    And sight in at 100yds.

    RANGE Elevation Elevation
    (yd) MOA (in)
    0 0.00 -1.5
    50 0.50 -0.3
    100 0.00 0.0
    150 0.50 -0.6
    200 1.00 -2.3
    250 2.00 -5.1
    300 2.75 -9.0
    350 3.75 -14.2
    400 5.00 -20.8
    450 6.00 -28.9
    500 7.25 -38.6
    550 8.75 -50.0
    600 10.00 -63.3

    If you are sighted in at 600yds, you should be 10.5" or 10MOA high at 100yds.

    Hope that helps.

    AJ
     
    Last edited: Oct 8, 2007

  3. HOGGHEAD

    HOGGHEAD Well-Known Member

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    Data

    Thank you for that information. I have that information already on hand. But still I thank you. My question is how high will I be at 100 yards if I am zeroed at 600 yards. I am trying to determine how many clicks I need to add to my scope-so I can hold dead on at 600.

    Or are you saying I will need to be 10.5 high at 100 to be dead on at 600 yards?? Sorry, I am a bit confused.

    I know that I am 8 inchs high at 100 yards to be dead on at 500. That is what my ballistic chart say's, and it was verifed by shooting. Thanks, Tom.
     
    Last edited: Oct 8, 2007
  4. DONTSTROKEME

    DONTSTROKEME Well-Known Member

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    Yes 10.5 high at 100y equals correct POA at 600.....if you use that drop chart.

    Joe Oakes
     
  5. AJ Peacock

    AJ Peacock Well-Known Member

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    Yes, 10.5" high, however there are a lot of other variables that can affect your drops, but that should get you close.

    To match the drop you mentioned at 500yds, I had to lower the muzzle velocity in Exbal. You will probably see a little bit more drop than the 10.5" above; probably closer to 11.5" high at 100yds. That means that you will need one more MOA than the data listed above. Remember 1 MOA at 600 yards is 6*1.047" =6.28"

    I'm pretty confident that you will be somewhere between the 10.5" and 11.5" high at 100yards to be dead on at 600yds.

    There are a number of things that make calculating drop charts a non exact science. One of the biggest, is that although chronographs are reasonably good at measuring relative velocities, they're not great at measuring absolute velocities. For example, a chrono might tell you repeatedly that your load averages 3250 but in fact it might be 50-100fps faster of slower. Also, your elevation, the humidity and the temperature also have an affect (not to mention the vertical component of wind, even if its from the side).

    AJ
     
  6. HOGGHEAD

    HOGGHEAD Well-Known Member

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    Thanks

    Thanks guy's, Tom.