Chrony draws a blank

[goose]

I got a new chronograph last winter and have used it about 5 times. I believe it's a comp electronics model. The first time I used it I had to move it around several times to get a reading. The next 3 times I used it it worked every time. Tonight I fired seven rounds with none of them registering. I moved it up and down, made sure it was centered and it was placed about 5 feet past the muzzle. It was a bright clear day, but it was early evening with a couple hours of light left. I tried turning it on and off, taking out the battery. How sensative are they to light conditions and positioning? Any other things to check?

[learning]

Five feet is probably to close. The muzzle blast is probably moving it way to much. I have knocked mine over from having it to close.

[goose]

Thanks, I was able to find in the manual for rifles they recomend 10-15 feet.

[learning]

If it does not have a break you might be better off at 15' if it has a break you should be able to bring it in a little.

[LRHWAL]

I'm not sure how the unit looks - i.e. screens and leads to a unit or screens with integral unit.

I need to put my unit right back at my shoulder to get a good reading otherwise the blast, even if it's behind the muzzle, can affect it.

So screens way up front, unit right back at your shoulder. I also sometimes shield it by popping it in the rifle case with the lid half closed. Seems to work better.

[jmason]

Muzzle blast and bright sun will kill your chrony every time. If it's really bright out the sky screens won't be any help unless the shade is cast directly over the sensors. Also they don't like low light before it gets dark out. They are very sensitive.

[JARHEAD1371]

Same thing has happed to me before. My chrony wouldn't read shots that were fired too early. Also if it's too clouldy that has effects on accuracy of the speed the chrony reads.