No two labradars are alike. Mine is extremely sensitive to aiming. I use an inertial trigger and that solves the triggering problems. Mine does not see bullets smaller than about a 75 grain .224 bullet. The fastest bullet I have ever gotten to register is 3880 fps. If I shoot 10 loads my labradar will miss "acquiring" at least one no matter how big it is. If you use it at an indoor range, stay away from the lanes next to the walls. Mine registers about 10 fps fast at the 3000 fps range.