Distance between the rifle barrel and the chronograph ?

Forums General Discussion Distance between the rifle barrel and the chronograph ?

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    SvilenP
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    Member

    Hello friends,
    I am interested in how far the distance (in centimeters or yards) should be between the rifle barrel and the chronograph – with the rifle spring and the PCP? At the PCP I know the distance should be bigger because of the air flow but how much?

    Thanks in advance!

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    davecole
    Participant
    Member

    I’ve tested this on my Red Shooting Chrony to see if the distance really matters in PCP and spring guns. 
    It doesn’t.
    Air does not cast a shadow.
    Besides, the pellet travels across the sensors before any air could have an affect. 
    Ideally, you want the muzzle reasonably close (say 6″) to the lead sensor to get the truest muzzle velocity. The further back you are, the greater chance you have of the pellet slowing down and the sensors pick it up. 

     

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    DonC
    Participant
    Member

    In Field Target 12 ft/lb competitors are tested with the muzzle at 6 to 8 inches from sensor.
    Chrony tip: I put 3M clear packing tape over my sensors. You can easily wipe off any accumulated dust. Without the tape can become a problem with the chrony.
     

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    agnthooziast
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    Member

    SvilenP did you get a rifle? Sorry I missed it if you did! Bill

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    SvilenP
    Participant
    Member

    Thanks for the answers. :yes:

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