The LabRadar has worked very well for me after I learned how to use in properly. You need to make sure that it is aimed at the target, so it is necessary to mount some kind of sighting device on the top. I use a 3" length of brass tubing, which fits into the aiming slot and allows me to align the unit precisely. Also, the plane of the unit must be as close as possible to the rifle and slightly behind the muzzle. The big advantage of the LabRadar is that you can measure velocity and shoot for groups at the same time.
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