Still nothing definitive that I can find about LabRadar's ability to pick up small caliber, high velocity bullets. The LabRadar distributor told me it has not been tested over 3900fps; furthermore he tried it on his HMR and said it picked up "most of the shots" . Most of the shots is not acceptable. Based on that I bought a Sporter Magneto Speed for temporary use until I could find out if LabRadar will meet my needs (20 cal at 4000+ fps) but I have had such an excellent experience with the Sporter I don't think I am going to buy LabRadar. The Sporter model has picked up 100% of the shots I have run through it and has not influenced POI nor group size on my bull barrels. It takes mere seconds to set up and travels tiny.