azshooter270
Active Member
I don't know if anyone is interested in this but…
I've had a Chrony Beta Master for many years and have used it to collect a large amount of data on my reloads, and factory loads, with several rimfire and centerfire rifles/cartridges. A. Lot. Of. Data.
Wondering about accuracy/repeatability of this unit, I always wished I could put two chronographs in-line and see how consistent the data was but never had another unit or opportunity.
Now I've joined the 21st century and bought the Garmin unit.
So I headed to the range and set up the old and the new. Chrony Beta Master about 7ft from the bench and the Garmin on the bench.
Shooting 80 total shots in 270Win, 7mm-08, and 300WSM I compared the velocity data obtained by both chrono's. All comparisons were per caliber and lot#(my reloads) of course.
The Garmin recorded velocities an average of 74fps slower than the Chrony.
The Garmin velocities had a 43% lower standard deviation compared to the Chrony.
The Garmin velocities had a 47% lower ES-extreme spread compared to the Chrony.
I'd call those significant differences.
At least I'll feel a little better about the quality/consistency of my reloads now.
I'm guessing you couldn't put 2 Garmin units side-by-side because the doppler radar would cross-talk between the two. But still, it would be interesting to see the correlation unit-to-unit.
I've had a Chrony Beta Master for many years and have used it to collect a large amount of data on my reloads, and factory loads, with several rimfire and centerfire rifles/cartridges. A. Lot. Of. Data.
Wondering about accuracy/repeatability of this unit, I always wished I could put two chronographs in-line and see how consistent the data was but never had another unit or opportunity.
Now I've joined the 21st century and bought the Garmin unit.
So I headed to the range and set up the old and the new. Chrony Beta Master about 7ft from the bench and the Garmin on the bench.
Shooting 80 total shots in 270Win, 7mm-08, and 300WSM I compared the velocity data obtained by both chrono's. All comparisons were per caliber and lot#(my reloads) of course.
The Garmin recorded velocities an average of 74fps slower than the Chrony.
The Garmin velocities had a 43% lower standard deviation compared to the Chrony.
The Garmin velocities had a 47% lower ES-extreme spread compared to the Chrony.
I'd call those significant differences.
At least I'll feel a little better about the quality/consistency of my reloads now.
I'm guessing you couldn't put 2 Garmin units side-by-side because the doppler radar would cross-talk between the two. But still, it would be interesting to see the correlation unit-to-unit.
