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Thread: Bad Chrony??

  1. #1
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    Bad Chrony??

    I inherited a Red "Shooting Chrony" with funky black plastic things that go on both sides and you shoot through a apr. 2" x 6" hole, the box had some smoke damage but the chrony was clean and turned right on.

    Took it out for the first time to check loads on a 7.62x25 Tokarev. The numbers made no sense
    load A -- 4335 , 01222
    load B -- 5309 , 1509
    Load C -- 7075 , 0057
    load D -- _122 (I gave up after that)

    Any ideas or is it a boat anker?

  2. #2
    Boolit Grand Master tazman's Avatar
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    IF you were in direct sunlight(not cloudy sky) and didn't have a diffuser shading the pickups sensors, you often get crazy numbers.
    The sensors need to be shaded from direct, bright sunlight.
    You can get away without on a cloudy, overcast day.
    When I lost my diffuser set when I moved, I cut up a gallon plastic milk jug and suspended strips of the jug over the sensors. Worked like a champ.

  3. #3
    Boolit Master

    pworley1's Avatar
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    You might be too close to it.
    NRA Benefactor Member

  4. #4
    Boolit Master mattw's Avatar
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    I see that when I am to close to mine! Had a 32acp the other day reporting 3212 fps! Moved back, problem solved. I do not know what it is trying to measure at that point... burnt powder column, invisible shock wave (sub-sonic to boot) or what.

  5. #5
    Boolit Master


    Kraschenbirn's Avatar
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    I've gotten strange numbers a couple times and repositioning the Chrony out of direct sunlight has made the problem go away.

    Bill
    "I'm not often right but I've never been wrong."

    Jimmy Buffett
    "Scarlet Begonias"

  6. #6
    Boolit Master

    Bent Ramrod's Avatar
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    With my Chrony, I consider a calm, overcast day “chronograph weather.”

    If that isn’t in the offing, I wait until the sun is at such an angle so the roof over the line shades the Chrony screens and diffusers.

    If that isn’t going to happen, taping a target over the screens to provide extra shading removes the “Error” messages and the 4000+ ft/sec readings. I curve the outer edges down so stray light doesn’t come in from the side.

  7. #7
    Boolit Grand Master

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    On my old chronograph that used the sky screens I tried the factory shades/diffusors over each sensor they were about 3" wide and would get errors in some light conditions. I made a one piece diffusor from thin plexi glass that over hung the front and back of the screens by 8" and covered the unit. I bowed this by heating it in an oven and bending forming then sand blasted it to diffuse the light coming thru this worked much better for me out doors.

  8. #8
    Boolit Buddy metricmonkeywrench's Avatar
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    Grmps send me a PM I think I have the similar model and may be able to help out

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