The problem with an F1 which I have is that the wad is moving at a slower velocity immediately out of the barrel as the petals open and the shot column proceeds ahead of it. The F1 is recording the speed of the wad as its the second thing through at the recommended 12' to set up the Chrony.My F1 will work with shotgun. I shot many rounds through it. Not into it
Bow and arrow, primed 357 shooting crayon or wax.
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