When people talk about calibrating their chronograph, they are usually talking about simply shooting a load of known velocity over the sky screens to ascertain that the set up is the same as usual. The "calibration" rounds are usually a pellet from known lot though a spring loaded gun or a .22LR from a case or carton that the shooter keeps for that purpose. If the readings are close to what the norm is, the chronograph is considered calibrated.
PACT claims that virtually all complaints of slow chronographs are either operator error, or unrealistic expectations.
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