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Muzzle velocity vs chrono distance

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  #1  
Unread 08-09-2008, 11:39 AM
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Muzzle velocity vs chrono distance

When you set the chrono up 10' to 15' from the muzzle, how much velocity is lost in that distance? Or is this considered muzzle velocity?

Want to know for ballistics program.

Thanks, Steve
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    Unread 08-09-2008, 12:07 PM
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    I always just use it as muzzle velocity. You are likely only loosing (3-5)fps or so.

    It really has little bearing on the numbers.


    AJ
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      #3  
    Unread 08-09-2008, 01:57 PM
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    Thank you,

    That is what I thought, but someplace in the back of my head, I thought that I had heard a more significant #. I will quit worrying about it.

    Thanks, Steve
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      #4  
    Unread 08-09-2008, 07:37 PM
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    Steve

    There is a simple way to find out if your chronograph has a proof channel.

    Set your front screen 10 feet from the muzzle.

    Fire a round.

    look at the difference between the proof screen and the record screen.

    If you have two feet between each screen and the velocity difference
    is "Say 5 ft/sec then you would have a true muzzel velocity of 30ft/sec
    faster than the recorded muzzel velocity. (25 ft/sec for 10 ft + 5ft/sec
    of proof screen= 30 ft/sec).

    One foot would be (5x10=50 + 5 = 55 ft/sec

    Simple

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      #5  
    Unread 08-09-2008, 07:59 PM
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    go here http://www.eskimo.com/~jbm/calculations/traj/traj.html
    put your data in and set the distance from muzzle to chronagraph and it'll tell ya your actual muzzle velocity. My 6.5 gibbs gains 8.2fps w/140 from 15ft to muzzle.
    RR
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