Except that BC varies widely from book values.
There are multiple solutions to the problem but a LabRadar gives you highly accurate, direct answers to the question.
I had the chance to put a LabRadar, FX Chrony, and Bulletseeker M4 side by side by side. The data values were pretty consistent when they worked.
LabRadar is bulky, needs to be aimed perfectly, and requires an inertial trigger for centerfire and microphone trigger for airgun to work reliably. It eats batteries and really needs the external battery pack. You do need to select a range (archery/handgun/rifle) but that’s pretty easy. It gives downrange velocity that is quite valuable to airgunners.
The FX is fiddly in that you have to select the right speed range. It wasn’t my unit so I didn’t get to know it well but that is a factor. MV only of course.
The Bulletseeker requires the least knowledge but I have found it needs to be aimed properly and seems to like certain positions relative to the muzzle. Still learning it but the sensitivity might be related to atmospheric conditions and how much disturbance appears at the muzzle. Also the Bulletseeker seems to read velocity several feet ahead, and looking at the raw data I think it could improve its velocity calculation method. Bulletseeker is configured to mount directly to the gun but I run mine mounted to a flexible mini tripod. As I understand it, Labradar backcalculates a V0 using the velocity trace.
David