Chronograph Recommendation

Discussion in 'The Ammo & Reloading Forum' started by Jesse17, Jan 25, 2012.

  1. BlackEagle

    BlackEagle Well-Known Member Supporting Member

    Joined:
    Nov 25, 2011
    Messages:
    4,675
    Location:
    UK
    I chose the CED because it's "modular", so if (when?) I shoot the chrony I only have to replace the parts that get damaged. I don't have extensive experience using chronographs, but I'm happy to tell you what little I've found out.

    At the base of each sky screen is an electric eye that sees the shadow of the bullet. The one closest to you is the "start" signal, the other is the "stop" signal. The shadow of the bullet passing over the first eye starts the timer and passing over the second stops the timer. The distance between the two electric eyes divided by the time is the speed.

    If one of the sensors doesn't see the bullet you get an error message on the readout screen. So far as I can tell this can be caused by poor or inconsistant lighting conditions, or muzzle blast inteference. I think part of my problem has also been the sun was too low, throwing the shadow off the sensors. Maybe wind making the chronograph move is also a factor.

    The manual says to place the chronograph about 7-10 ft away from the muzzle to eliminate muzzle blast inteferance. The wires connecting the chronograph to the contoller are about 20 ft. long.

    The sensors can be separated by 2 ft, or 4, 6 or 8 ft.
    I tend to see if I can get a decent group, then check for speed; concentrate on just not hitting the chrony, and if I can, as Bindernut suggests, check fliers against speed.

    From watching some of the others in the club, I have noticed some guns just don't shoot tight groups. My .223 with 1:9 twist heavy barrel will knock the center out of the target at 100 yards on a regular basis, 1/2" groups of 10 using my reloads. Others in the club are happy to get a 2 or 3 inch group at 100 yards with their sporting rifles. The M-16/AR15 is usually a lot more precise/tighter group than an AK47.

    As a barrel warms up it often affects precision, but there are lots of others on the forum who know more about those things than I do.

    I suggest getting a couple of extra 9 volt batteries to power the unit.

    The unit comes with software and you can download via usb directly from the unit to your computer, and then export the data to an Excel spreadsheet. I haven't tried it with an Openoffice spreadsheet or other spreadsheet.

    I got a cheap tripod from ebay, or I can use a bench at the range, depending on the wind.

    Here's a link to the owner's manual .pdf:
    http://www.shootingsoftware.com/ftp/CED Manual.pdf
  2. Zhurh

    Zhurh Active Member

    Joined:
    Mar 19, 2010
    Messages:
    2,116
    Location:
    Upper Yukon, Alaska
    Thanks to all, I'll probably get that CED end of nx week if we get mail plane with predicted snow. I really won't start shooting until April anyway. It's still around zero, nice for cutting/hauling nx winters birch in with snowmachine, but I'll wait till it's above freezing to start shooting off that porch bench. I'm reloading some tonight; keep working on the 30-378 for nx fall's hunting.
  3. BlackEagle

    BlackEagle Well-Known Member Supporting Member

    Joined:
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    4,675
    Location:
    UK
    Got the chronograph out and got some numbers. It's picky about light and being set up straight. I got some error messages; it could have been due to wind shaking the whole thing, or it could have been not quite straight on to the trajectory. I tried marking the heads black and the first of those worked OK, then I got error messages. The chronogaph was a little squint to the trajectory. Straightened the chronograph and got some more numbers, and then some errors. The wind was shaking the chronograph some but it was still straight with the trajectory. I tried some unmarked bullets and got results for those as well. Here's the setup at the range...

    Now to digest the numbers. I can work out trajectories better now. :)

    IMAG0146.jpg

    IMAG0147.jpg

    IMAG0145.jpg
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