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Thread: Bad Chrony??

  1. #1
    Join Date
    Jul 2016

    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
    Join Date
    Jan 2014
    west central Illinois
    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
    Join Date
    Dec 2013
    You might be too close to it.
    NRA Benefactor Member

  4. #4
    Boolit Master mattw's Avatar
    Join Date
    Oct 2014
    East Central Illinois
    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
    Join Date
    Dec 2006
    East Central IL
    I've gotten strange numbers a couple times and repositioning the Chrony out of direct sunlight has made the problem go away.

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

    Jimmy Buffett
    "Scarlet Begonias"

  6. #6
    Boolit Master

    Bent Ramrod's Avatar
    Join Date
    Apr 2005
    Southern Arizona
    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

    Join Date
    Mar 2013
    Northwest Ohio
    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
    Join Date
    Apr 2016
    Grmps send me a PM I think I have the similar model and may be able to help out

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