i dont know if it was on this forum or not, i came across a software chrony that used a pc and a mic. it looked very interesting.
anyone know the site were i can down load it.
The previous thread is here: https://www.airrifle.co.za/showthread.php?t=5125 and I think there is more than one program, which can do that. Just do a google search...
However, I also wouldn't trust such measurments.