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Chronogragh Help!

Discussion in 'Anything Airgun Related' started by Mike Watkins, Jun 26, 2019.

  1. Mike Watkins

    Mike Watkins Woody Woodgate

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    Hi guys.

    Is there anyone out there living in the Ludlow - Leominster- Tenbury Wells area with a Combro CB-625 mk4? Or indeed any chrono come to that?

    I’ve just purchased a CB-625 mk4 but it is wildly out compared to a Crony F1 I’ve borrowed from my local club. After a ten shot group the Combro reads: 595fps and the Crony reads: 610.6fps (yes, it’s the low power setting on an FAC air rifle), which is well outside being able to re-calibrate it.

    I would really like to try another chrono to see which of the two is closest to the truth. I’m just looking to maybe popping over, put ten shots through it and then leaving you peace!

    Thanks, Mike.
     
  2. Blister

    Blister Busy Member

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    my combro reads lower then my HT X3000
    and it gives wild readings compared to it i seem to get a more consitant spread of reading from the x3000. i always go with the power my combro gives me.
    this is the problem when you start getting more then one chrono that give you different readings you never know which one to go by
     
    Mike Watkins likes this.
  3. secretagentmole

    secretagentmole Low down, dirty and quiet...

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    How far away from the Chrony do you have to fire the gun?

    Remember the position of the chrono, Combro on the end of the barrel, Chrony a foot away?
     
  4. Mike Watkins

    Mike Watkins Woody Woodgate

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    Yes you’re right, the Combro is at the end of the barrel and I guess the Chrony was 6 to 8 inches away. Are you thinking that it might make a difference? I never thought about it.
     
  5. timmytree

    timmytree Top Poster

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    Mole and Mike, just read your posts back you dipsticks! If the chrony was further away it would read slower than the combro not faster! :D
     
    RichieRich likes this.
  6. secretagentmole

    secretagentmole Low down, dirty and quiet...

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    Yup, it would, I transposed the figures when I read them!
    :facepalm:

    The difference between the two is 2.5% so if one is 1% under reading and one 1% over reading.....
     
  7. pbrown

    pbrown Very Active

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  8. Mike Watkins

    Mike Watkins Woody Woodgate

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    pbrown likes this.
  9. Mike Watkins

    Mike Watkins Woody Woodgate

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    Agreed, but would 6 inches make such a difference?
     
  10. TR158

    TR158 Keyboard Hero

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    6 inches makes all the difference... or so my long suffering girlfriend tells me

    I'll grab my coat.

    .
     
    Mike Watkins and Buckshot like this.
  11. robs5230

    robs5230 Oversprung

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    Personally I'd try another chrono rather than that particular chrony.
    The F1 is very susceptible to changing light conditions.
     

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