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Labradar Chrono work on 17 and 20 cal ?

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?
 
I run both the LabRadar and an Oehler 35P, sometimes at the same time. The Oehler is fabulously reliable, but I love the LabRadar for the convenient size and quick setup. My experience is that the LabRadar can a bit be finicky to get consistent results, especially with "marginal" calibers on both the small and big end. When shooting my 20VT and the even tinier 5.7x28, I need to position the LabRadar within a couple inches of the muzzle before the muzzle blast will trigger it consistently. Conversely, it has to be positioned well away from a braked 338 Lap Mag or the muzzle blast will rack it off target! Once you find the sweet spot it is a joy to shoot with.
 
I’ve had zero issues running mine with a 204 and 55s. The only problem arises when I shoot suppressed and a little bit of adjusting and you’re back on track.

I believe the speed is only rated to 3800fps though so the fast stuff probably won’t read.
 

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