I want to buy a Labradar but their only distributor (Richard Moser) can not assure me it will work for fast 17's and 20's. He personally has used the device with 17 HMR and said it works pretty well but does not pickup some shots. I question how it will work with the 17 Hornet which is another 1000 fps faster than the HMR. He does not know if the manufacturer has tested the device with 20 calibers. All he can offer is that the manufacturer tested it at 3900 fps with a "small bullet", caliber unknown. Is anyone using this device with success on 17 and 20 calibers over 3500 fps?