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chrony and sun/overcast

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Unread 09-14-2007, 04:44 PM
Gold Member
Join Date: Oct 2004
Posts: 723
chrony and sun/overcast

I wonder if you see a big difference in read velocities when using the crony in a sunny day and then clouds/no direct sunlight??

I was testing some velocities today, first shot with sun 3120, second shot there was a big cloud, 2890 ??? same load, same bullet, weighed cases....

do you experience such a big influence, or it´s pribably my crony ?

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Unread 09-14-2007, 07:36 PM
Platinum Member
Join Date: Jul 2004
Location: Texas
Posts: 6,874
All Chronographs need good light to work properly

I use the ohler 35 p with the proof screen ( 3 screens )
and when i'm in poor light it sometimes gives me an error
warning so I edit that shot.

Chances are thats what is happening to you with that much
velocity spread.

Or if your shooting less than 6' to 8' from the chrony the shock
wave from the muzzel blast can cause erratic readings.

I hope this helps
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Unread 09-14-2007, 08:28 PM
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Join Date: Sep 2002
Location: Illinois
Posts: 837
Cloudly days are actually brighter than clear days. You have a better chance of getting a no start or stop signal on a clear cloudless day.
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Unread 09-15-2007, 11:39 AM
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Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,826
I've "noticed" that cloudy days are much better for the Chrony than bright sunny days.

Bright vs cloud makes a difference in readings. That much of a difference is unusual in my experience.
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
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Unread 09-16-2007, 02:19 PM
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Join Date: Oct 2004
Posts: 723
Thanks for the answers. I agree that is way too much difference to be caused just by the clouds.-will check the crony with another unit.
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Unread 09-16-2007, 04:54 PM
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Join Date: Sep 2005
Location: Oracle, Az
Posts: 73
Fast moving clouds can also effect your reading.
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Unread 09-16-2007, 09:54 PM
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Join Date: Jun 2004
Location: Texas
Posts: 1,072
I haven't used a Chrony, does it have a diffuser above the eye? As DB and Roy said, bright clear sunlight makes it harder for the chronograph to "see" the bullet, and the Oehler skyscreen III's have a big translucent orange diffuser above each eye to stop the glare.

Unless the processor in the chrono is screwing up, I'd suspect extreme spread on the load. I don't know if the shock wave could rock the screens enough to cause that much deviation without just failing to read. Best I can recall, shock waves, when they read, show around 1300 fps. I set my 1st screen about 7-8 yds. Makes a smaller window to shoot through, but stops most errors. I've never thought about a clear or cloudy day making a difference in the readings. I just figured it would read if it had enough light and wouldn't if it didn't. Another addition to the huge list of stuff that I don't know.

I'd like to know what happens when you make the comparisons.

Thanks, Tom
Texas State Rifle Association Life Member
NRA Endowment Life Member

A big fast bullet will beat a little fast bullet every time
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