MagnetoSpeed LLC worked with Southwest Research Institute(SwRI) to quantify the ballistic accuracy of the MagnetoSpeed sensor package. SwRI uses a bench top range setup to do ballistic tests on ammunition and uses a double Oehler sky screen setup to accurately capture bullet velocity. In the table above, seven shots were taken all using the same ammunition (7.62x51mm M80) with the MagnetoSpeed sensor as well as the double skyscreen Oehler setup. Velocity 1 above is the velocity measured at the first set of skyscreens and Velocity 2 is read at the second set. When the muzzle velocity is back calculated based on the distance between skyscreen sets and the muzzle we obtain the "Calculated Muzzle" velocity in feet per second (fps). Comparing this to the Magnetospeed data we get percent differences of less than half a percent. This data series shows that the MagnetoSpeed is at least 99.6% accurate to the Oehler system used at SwRI for this test.
jrs - First saw one of these at the local range about a month ago. It was reading low and the guy that owned it told me the next week that he called the company and they said, "No problem. We'll issue an RMA and pickup tag. Just box everything in the original box and here's the tracking number for your replacement unit."
So last time at the range the new one was there and it was dead accurate. It got put on several handloader's rifles who knew the velocity of their loads.
I've ordered mine already. I'll update when I get it the end of the month.