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Drop chart HELP

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  #1  
Unread 03-24-2011, 07:05 PM
tlk tlk is offline
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Drop chart HELP

Question: can I use only three or four distances to set up a drop chart with ballistics software to a high degree of correctness? Example: can I zero at 100, find my drop at say 300, 600 and 800 and then use a ballistics calculator to determine the drops (and ultimately a moa range card) for every 50 yds out to say 900 yds?

Is there any reason to burn the powder and time to do this manually? Any help would be greatly appreciated.
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  •   #2  
    Unread 03-24-2011, 08:38 PM
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    Re: Drop chart HELP

    Well thats about the way we do it
    but we go back out and shoot the chart to verfiy the numbers
    ONce we get a load we chrono it shoot a few differant ranges and enter all that into the program get a chart out to 1000 yards then shoot the numbers to verify and adjust as needed
    The most we have everbeen off is a click or two
    retiredcpo
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      #3  
    Unread 03-24-2011, 10:36 PM
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    Re: Drop chart HELP

    Quote:
    Originally Posted by retiredcpo View Post
    Well thats about the way we do it
    but we go back out and shoot the chart to verfiy the numbers
    ONce we get a load we chrono it shoot a few differant ranges and enter all that into the program get a chart out to 1000 yards then shoot the numbers to verify and adjust as needed
    The most we have everbeen off is a click or two
    retiredcpo

    Yep, tried and true.
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      #4  
    Unread 03-24-2011, 10:42 PM
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    Re: Drop chart HELP

    Yep! .
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      #5  
    Unread 03-25-2011, 06:44 AM
    tlk tlk is offline
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    Re: Drop chart HELP

    So you guys are still shooting the entire range card for verification of data? I was under the impression (hoping really) that if I got three or four points in an arc each at a specific distances any point along the arc could be calculated with a standard fomula, and it would be all good with no need to verify. It's fine that it needs to be done, but what causes the delta between the math and the actual arc of the bullet?
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      #6  
    Unread 03-25-2011, 07:16 AM
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    Re: Drop chart HELP

    Well I supose you could assume it was all good but we wont take a shot at an game animal unless we know our drop for the the shot
    Now a coyotee or rock chuck we would take the shot.
    Besides I like to shoot so dont mind shooting the chart
    pratice makes you better
    If the chart is close you wont burn very much ammo
    one a round or two for each yardage
    Go shoot it and make sure.
    Sounds like you havbe never shot long range, Time behind the gun would help you out
    Just my 2 cents
    Retiredcpo
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      #7  
    Unread 03-25-2011, 07:20 AM
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    Re: Drop chart HELP

    Quote:
    Originally Posted by tlk View Post
    So you guys are still shooting the entire range card for verification of data? I was under the impression (hoping really) that if I got three or four points in an arc each at a specific distances any point along the arc could be calculated with a standard fomula, and it would be all good with no need to verify. It's fine that it needs to be done, but what causes the delta between the math and the actual arc of the bullet?

    You have to verify to be sure that the numbers are correct, After all it is only a formula and
    a computer.

    The cause for the delta is normally that the listed BCs are effected by velocity,twist rates, ETc
    and are normally not correct from the manufacture.

    You dont have to check every distance, but I would recommend at least two(Middle distance and
    the max distance to be shot.

    It does not matter what the BC and drop is, what matters most is the accuracy of the drop chart !

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