Finally had a chance to get mine out to the range for the first time. I used it on both my Vudoo .22 and my 6GT. I ran 15 rounds through the 6GT and it failed to read one shot. When using it on the Vudoo, it registered two shots that were actually fail to fire rounds. It would register about 250 FPS for those two rounds. I don't think I've read anyone posting about that. Maybe I've missed it. It was rifle mounted for both rifles.
My only real complaint is that you can't have it read Min, Max, SD, ES and Average velocity on the same screen. I had to go into the settings to get. I would be happy to just have Min, Max, SD, and Average as I can easily calculate ES with those reading.