Anyone use a radar based chrono near the ground?

[lordpaxman]

Just curious if anyone has used a radar based chronograph when shooting from a grounded position. I had my LabRadar setup on the older flat stand, which puts the bottom of the unit about 3” from the ground. I’m doing some .243 development and was prone. The unit would trigger but I’d get the “Acquisition error”. The target was 100 yards away, about 18” high, the ground was slightly undulating but obviously nothing higher than the bullet travel. The unit was aimed at the target so that wasn’t the issue, and yes the settings were for rifle.

I’ve measured V’s from this gun before, but from a bench. I got to thinking that the radar beam wasn’t happy being that close to the ground and perhaps couldn’t pick out the bullet from the background.

Today’s project is a shooting bench which will find it’s home in the “big field”.

 

[thump_rrr]

Just curious if anyone has used a radar based chronograph when shooting from a grounded position. I had my LabRadar setup on the older flat stand, which puts the bottom of the unit about 3” from the ground. I’m doing some .243 development and was prone. The unit would trigger but I’d get the “Acquisition error”. The target was 100 yards away, about 18” high, the ground was slightly undulating but obviously nothing higher than the bullet travel. The unit was aimed at the target so that wasn’t the issue, and yes the settings were for rifle.

I’ve measured V’s from this gun before, but from a bench. I got to thinking that the radar beam wasn’t happy being that close to the ground and perhaps couldn’t pick out the bullet from the background.

Today’s project is a shooting bench which will find it’s home in the “big field”.

When shooting from the prone position, I put the LabRadar on a tripod straddling over the barrel

 

[lordpaxman]

When shooting from the prone position, I put the LabRadar on a tripod straddling over the barrel

Interesting! What offset do you use and how high is your target?

 

[thump_rrr]

Interesting! What offset do you use and how high is your target?

The target is typically 3 to 4 feet off the ground.
I usually have it on 8 inch offset. I’ve never had an issue with it, picking up the bullet..

 

[lordpaxman]

Just FYI:
LabRadar responded to an email question on this subject and suggested 12” minimum height above the ground for the unit to be effective. Good to know!