Home Forums Reloading Big Game Rifles Chronographs accurate in overcast-sky conditions?

My chrono set-up features an Oehler 33 w/ 4' spacings and a Chrony positioned exactly in the middle. This way, I get 2 machines reading every shot, which really cuts down on lost readings due to error messages.

In bright, glaring sunshine, the 2 chronos will occasionally give readings as much as 100 fps apart, and rarely, much more. Could it be due to bullet "glint", as some writers have theorized? But on overcast days, they agree almost exactly.

If I can help it, I prefer to NOT waste bullets on bright, sun-shiny days.

WEll I see no one from the Pacific NW has chimed in...

using a chrony in overcast environments, WELCOME to Oregon...

I have the basic shooting chrony... and believe it or not, I use it without the screens when it is overcast during the winter most of the time... and have less error readings...

but during overcast, the readings with or without the screens are the same...so I actually prefer to chronograph loads on cloudy days...

I would be very interested in this article (linky please anyone).
Anybody care to post a post a photo of how the tape is used.
I dislike dealing with those dang diffusers!!

Thanks,
Claybreaker
aka Wally

I have 2 Pacts and don't have any problems on sunny or cloudy day.

All I use anymore are Chronys of one version or another. I almost never use the screens at this always-low-sun latitude. But the units work most reliably when the sky isn't perfectly clear. The single time I've ever had real problems catching speeds was when the sky was perfectly clear on a crisp fall evening; the sun was bright and low. Only by laying the unit sideways toward the light and using screens could I pick up some shots, very frustrating.

Daisy Red Ryder or your favorite 22lr.... Mark the cord that leads to the display at 10' with a piece of tape to make sure it's the same distance from the muzzle each time you set up.