To truly calibrate your chrono, you would need to have an object of known velocity pass through the sensors.
You don't have an object of known velocity.
If you did, you would then need a way of adjusting your chrono.
You don't have one.
If you had several objects, each with different known velocities, you could perhaps develop a formula to adjust your chrono's results.
Since you don't have one such object . . .
Calibration rounds? They'd have to come supplied with the gun that shot them for timing.
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