Chronograhs

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Originally Posted by Marty Henry

Doesn't the magnetospeed measure just muzzle velocity, an optical chrony like the forum one around 5 m from muzzle and the garmins like a labradar using Doppler so picks it up some distance away. Maybe that's your answer, maybe not.

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I think this might be the answer - in any case 60fps variation if consistent is less than a percent or so depending on the muzzle velocity you are working with?

The difference between a Magnetospeed and a Garmin should be maybe 10fps, plus or minus. Based on what I've seen