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Chrony Question

I was out working up a loads for my 6.5 Grendel yesterday and my Beta Chrony started doing some weird stuff. My first two groups of 3 it gave me normal numbers well within my predicted range. But after those first 6 shots in started spitting out numbers that made no sense. I made no changes to the settings on the Chrony. Weather was overcast and rainy yesterday. Chrony was out of the rain but 10ft from the muzzle. Here are all the numbers it gave me from start to finish.

2302
2284
2252
------
2312
2303
2314
------
849.9
848.9
855
854
------
866.3
865.4
865.6
-------
866.5
867.3
870.2
864.5
-------
880.2
872.8
879.3


I converted these lower number from meters to feet to see if the chrony decided to go metric on me, but the numbers didnt correlate to the 6 shots that I got accurate readings on. Does anyone have any idea what these lower numbers are supposed to represent? Are they a different unit, or just very poor, inaccurate readings from my chrony? Thanks for any help.
 
My experience using the Chrony with calibers that are not known to have terrible muzzle blast in conjunction with longer barrels (28+) has been to cut the distance of the unit from the muzzle in half... I've even had great success placing it 24" away from a 30" pipe (6.5x284@ 2950fps)
 
mao,

I found with my Beta Master that using just the short screen supports, and being VERY careful when aiming, that the results were more consistent.

Dennis
 
I think it's susceptible to overcast days, it needs light. They make a fix for it

http://www.shootingchrony.com/manual_ChronyLedLamp.htm

edit; my friend "fixed" mine when he borrowed it. It is no more.
 
mao0720 said:
I was out working up a loads for my 6.5 Grendel yesterday and my Beta Chrony started doing some weird stuff. My first two groups of 3 it gave me normal numbers well within my predicted range. But after those first 6 shots in started spitting out numbers that made no sense. I made no changes to the settings on the Chrony. Weather was overcast and rainy yesterday. Chrony was out of the rain but 10ft from the muzzle. Here are all the numbers it gave me from start to finish.

2302
2284
2252
------
2312
2303
2314
------
849.9
848.9
855
854
------
866.3
865.4
865.6
-------
866.5
867.3
870.2
864.5
-------
880.2
872.8
879.3


I converted these lower number from meters to feet to see if the chrony decided to go metric on me, but the numbers didnt correlate to the 6 shots that I got accurate readings on. Does anyone have any idea what these lower numbers are supposed to represent? Are they a different unit, or just very poor, inaccurate readings from my chrony? Thanks for any help.

Call the folks at Shooting Chrony: http://www.shootingchrony.com/address.htm I'll bet they've got the answer. Toll-free: 1-800-385-3161 (9 am - 5 pm E.S.T.)
 
wedgy said:
I think it's susceptible to overcast days, it needs light. They make a fix for it

http://www.shootingchrony.com/manual_ChronyLedLamp.htm

edit; my friend "fixed" mine when he borrowed it. It is no more.

On mine it was the other way around, bright sun that was low in the sky shining in under the sunshades(late winter) and I got those goofy readings. I could be wrong, but if they needed light, there would be no need for sunshades. If you can afford it, buy a magneto speed and eliminate the sun problem.
 
My Alpha seems to be VERY finicky to ideal light conditions. If it's overcast that doesn't necessariarily mean my chrony will read. Mine also wont read at lower sun angles. I've also realized you need a GOOD battery or else no read. Even though I will get the flashing AL , if the battery voltage is questionable my sensors won't pick up the bullet.
 
The other possibility is the chrony moved. I know you didn't touch it but being on a tripod (I presume), the wind can cause it to rotate enough that although you cannot see the difference can cause what you see.
 
I went with the LED kit and never looked back. No more anxiety about weird readings ruining a long drive to the range. I'm very happy.
 
DeltaBravo said:
mao,

I found with my Beta Master that using just the short screen supports, and being VERY careful when aiming, that the results were more consistent.

Dennis

That's the proper way when "clocking" rifle rounds. The long supports are for use with a pistol.

I found that the "Chrony" series of chronograph are extremely sensitive to light. When they go "strange" chances are they don't have enough light to for them to operate properly. At my range where there are huge overhead baffles, and no direct lighting, I just gave up and bought a good unit with I/R sensors.

You can get the lighting kit for he Chrony's or just get some LED strips from an auto parts store and power them with a small motorcycle battery. Tape the LED strip to the top of the screens with the led's pointing down. A cheap solution.
 

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