This is something I too have thought about. But, I guess I'm not motivated enough to dig in.

One thought I have had was to probe the circuitry of my chrono to discover the sensor outputs. Using a O'scope connected to the chrono, fire a round and see if the chrono timebase is close to that of the scope.

I already haul too much stuff to the range.

Has anyone else thought about this along these lines?

For now I just fire a 22LR round and see if it is close to what the container label states.