For those interested in how an old fold-out Chrony compares to the new LabRadar.
I set them both up with the radar beside the gun and the Chrony out front and fired 21 rds to compare. Then entered the average Chrony velocity in JBM to correct it back to muzzle velocity (MV).
The data.
Looks like the MV's are a close 3fp to each other. I am surprised at how similar the results are. I was under the impression the old Chrony with its 5% error compared to the (presumably) more precise 0.1% radar error would have it showing a higher standard deviation (SD). They are almost the same. The SD reflects the quality of the factory ammunition of course but I assumed the SD's would be different, with the Chrony higher than the radar. I also assumed there would be a bigger difference between muzzle velocities...More fool me!
The difference in muzzle velocities is almost negligible. 3fps can be accounted for in angle of the chrony relative to the flight path, or how open and flat the device was. Or how accurately I measured the distance from muzzle to Chrony which wasn't very scientific (paced it out). Maybe the radar is part responsible for the difference. The difference is so low that it's not going to concern any pressure or ballistic calculations you might use it for.
Looks like the old fold-out Chrony is as precise as a LabRadar. Now I have to convince myself the cost was worth it in other ways...
(Footnote. The test was done at night with LED light-strips on the Chrony. I found being able to control the light across the sensors at night gives the most reliable and error-free readings).
I set them both up with the radar beside the gun and the Chrony out front and fired 21 rds to compare. Then entered the average Chrony velocity in JBM to correct it back to muzzle velocity (MV).
The data.
Looks like the MV's are a close 3fp to each other. I am surprised at how similar the results are. I was under the impression the old Chrony with its 5% error compared to the (presumably) more precise 0.1% radar error would have it showing a higher standard deviation (SD). They are almost the same. The SD reflects the quality of the factory ammunition of course but I assumed the SD's would be different, with the Chrony higher than the radar. I also assumed there would be a bigger difference between muzzle velocities...More fool me!
The difference in muzzle velocities is almost negligible. 3fps can be accounted for in angle of the chrony relative to the flight path, or how open and flat the device was. Or how accurately I measured the distance from muzzle to Chrony which wasn't very scientific (paced it out). Maybe the radar is part responsible for the difference. The difference is so low that it's not going to concern any pressure or ballistic calculations you might use it for.
Looks like the old fold-out Chrony is as precise as a LabRadar. Now I have to convince myself the cost was worth it in other ways...
(Footnote. The test was done at night with LED light-strips on the Chrony. I found being able to control the light across the sensors at night gives the most reliable and error-free readings).
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