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garmin xero c1 chrono speed

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bahabill

Well-Known Member
Joined
May 28, 2020
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58
Location
Arizona
I am curious, does the C1 chrono actually read the muzzle velocity or is it reading the impact velocity. Asking cause all of my load development is at 100 yards being the longest they have at my range. But i seen a guy using his lab radar at 50 yards and said it reads impact velocity! the funny part was he couldnt read anything cause he was suppressed and it didnt work but I moved my c1 over and worked perfectly. He was going to store to buy one right after LOL.
but left me questioning the C1. is it actual bullet leaving muzzle speed or the speed it impacts the target. Getting new rifle ready for hunt and running out of time to fully experiment with. Thanks
 
Neither unless you are impacting at 30 ish yards. The only way to read muzzle velocity is when we imbed sensors in the barrel. Otherwise, even the Magnetospeed doesn't read actual muzzle velocity.

What you do get is a computed muzzle velocity using a fairly common method. The same thing the Lab Radar and some others do. Most light screen devices do not back calculate, but instead just give you velocity at that devices location. Note this is Most not All.
 
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It seems to me that the C1 can't measure instantaneous muzzle velocity. It has to be computed back. Bullets are slowing by 0.8 to 3+ fps each yard farther they get from the muzzle. At 10 yards my 220 swift bullets have already slowed by 20-30 fps below muzzle velocity. Velocity is measured by time to travel some distance. The bullet has to travel some distance to measure the travel time.

Placement of the C1 relative to the muzzle would seem to also affect the measured speed. Both distance behind or in front of muzzle. And angular offset from the muzzle could affect the measured velocity.

I really don't know anything about how it's done. Would be interested in an explanation.
 
As I understand it, the LabRadar grabs a velocity reading some distance in front of the muzzle/unit. Since it's a radar reflection it knows how far away the reading was and calculates what it would be at the muzzle.

The LabRadar allows the user to capture several velocities at user defined distances of the projectile on its way to the target. So it is possible to read the velocity at 50 yards if you desire.
 

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