[Dakota]

Calibration of radar guns is important, and is one of the (few) ways to beat a radar-clocked speeding ticket (police get lazy and skip a calibration deadline).

HOWEVER, the variation is in fairly small percentages, I would expect.

Baseball v softball - I haven't a clue why that would be different unless it is related to the path of the ball relative to the position of the gun - that IS important, since the radar gun basically is measuring the doppler effect of the moving ball on the radar waves. But, again, I would expect the variability to be relatively small so long as the gun operator is REASONABLY behind the catcher (not off to one side or the other much).

Far and away the biggest calibration problem with radar guns measuring the speed of fastpitch pitchers is in the transfer of the data from the gun's readout to Daddy's brain.